Brucellosis

Brucellosis
Other names: Remitting fever, undulant fever, Mediterranean fever, Maltese fever, Malta fever, Gibraltar fever, Crimean fever, goat fever, Bang disease, rock fever[1][2]
Brucella spp. are seen mostly as single cells and appearing like “fine sand”.
SpecialtyInfectious disease
SymptomsFever, headache, muscle pains, joint pains[3]
ComplicationsTesticular inflammation, endocarditis, spleen enlargement[4]
Usual onset2 to 4 weeks after exposure[4]
TypesB. abortus, B. canis, B. melitensis, B. suis[1]
CausesBrucella[1]
Risk factorsUnpasteurized dairy products, undercooked meat[5]
Diagnostic methodBlood cultures, agglutination testing[1]
Differential diagnosisInfectious mononucleosis, malaria, leptospirosis, meningitis[1]
TreatmentAntibiotics[4]
PrognosisRecover can take 6 months[1]
Frequency>500,000 a year[6]
Deaths2% risk of death[1]

Brucellosis is an infection caused by bacteria of the Brucella type.[1] Symptoms may include fever, headache, muscle pains, and joint pains.[3] Symptoms typically occur 2 to 4 weeks after exposure and may come on gradually or suddenly.[4] Without treatment infection may lasts for years.[1] Complications may include testicular inflammation, endocarditis, miscarriage, septic arthritis, or enlargement of the spleen.[1][4]

Infections in humans are caused by four specific types of Brucella: B. abortus, B. canis, B. melitensis, and B. suis.[1] As few as 10 to 100 organisms can result in disease.[1] It most commonly spreads as a result of eating unpasteurized dairy products from infected animals.[5] It may also occur from eating undercooked meat or working with infected animals.[5] Rarely spread may occur between people.[5] Diagnosis is usually by blood cultures or agglutination testing.[1]

Treatment of those over the age of 8 is a combination of doxycycline and rifampin for 6 weeks.[4] Younger people may be treated with trimethoprim/sulfamethoxazole.[4] Different antibiotics may be used for complications.[4] Exercise may speed recovery.[1] Death occurs in 2% of cases.[1]

Over 500,000 cases are reported a year as of 2009.[6] In 2010, 115 cases were diagnosed in the United States.[1] Areas more commonly affected include those bordering the Mediterranean, Central and South America, Asia, Africa, and the Middle East.[7] In 2022, at least 46 cases occurred in Osh, Kyrgyzstan.[8] George Cleghorn gave the first description of the condition in 1751.[1] The disease is named for Sir David Bruce who led the organisation that identified the bacteria as the cause of the disease in 1886.[1]

Signs and symptoms

A person with brucellosis from before 1930

The symptoms are like those associated with many other febrile diseases. The duration of the disease can vary from a few weeks to many months.In the first stage of the disease, bacteremia occurs and leads to the classic triad of undulant fevers, sweating, and migratory arthralgia and myalgia.[3][9]

Gastrointestinal symptoms may include:[10]:

This complex is known as Malta fever.[11] During episodes of Malta fever, melitococcemia can usually be demonstrated by means of blood culture in tryptose medium or Albini medium. If untreated, the disease can give origin to focalizations or become chronic. The focalizations of brucellosis occur usually in bones and joints, and osteomyelitis or spondylodiscitis of the lumbar spine accompanied by sacroiliitis is very characteristic of this disease.The consequences of Brucella infection are highly variable and may include arthritis, spondylitis, thrombocytopenia, meningitis, uveitis, optic neuritis, endocarditis, and various neurological disorders collectively known as neurobrucellosis.[12][3][9][13]

Cause

Further information: Brucella

Brucellosis in humans is usually associated with consumption of unpasteurized milk and soft cheeses made from the milk of infected animals—primarily goats, infected with B. melitensis and with occupational exposure of laboratory workers, veterinarians, and slaughterhouse workers.[14]

Some vaccines used in livestock, most notably B. abortus strain 19, also cause disease in humans if accidentally injected.[12][15]

Overall findings support that brucellosis poses an occupational risk to goat farmers with specific areas of concern including weak awareness of disease transmission to humans and lack of knowledge on specific safe farm practices such as quarantine practices.[16]

  • Processed using the Gram-stain method, photomicrograph revealed the presence of numerous Gram-negative, coccobacillus, Brucella suis bacteria.
    Processed using the Gram-stain method, photomicrograph revealed the presence of numerous Gram-negative, coccobacillus, Brucella suis bacteria.
  • Granuloma and necrosis in the liver of a guinea pig infected with Brucella suis
    Granuloma and necrosis in the liver of a guinea pig infected with Brucella suis

Pathophysiology

In terms of the mechanism of this condition we find that Brucella organisms are phagocytosed and delivered to lymphoid tissue by macrophages. After arriving at the lymphatic system replication begins locally.[12]

Diagnosis

Blood agar plate culture of Brucella suis.

The diagnosis of brucellosis relies on:[12][17][18][19]

  1. Demonstration of the agent: blood cultures in tryptose broth, bone marrow cultures: The growth of brucellae is extremely slow.
  2. Demonstration of antibodies against the agent either with the classic Bengal Rose reactions, with ELISA for IgM antibodies associated with chronic disease
  3. Histologic evidence of granulomatous hepatitis on hepatic biopsy
  4. Radiologic alterations in infected vertebrae: the Pedro Pons sign and marked osteophytosis are suspicious of brucellic spondylitis.

Definite diagnosis of brucellosis requires the isolation of the organism from the blood, body fluids, or tissues, but serological methods may be the only tests available in many settings. Positive blood culture yield ranges between 40 and 70% and is less commonly positive for B. abortus than B. melitensis or B. suis. Identification of specific antibodies against bacterial lipopolysaccharide and other antigens can be detected by the standard agglutination test (SAT), rose Bengal, 2-mercaptoethanol (2-ME), antihuman globulin (Coombs’) and indirect enzyme-linked immunosorbent assay (ELISA). SAT is the most commonly used serology in endemic areas.[20][21]

An agglutination titre greater than 1:160 is considered significant in nonendemic areas[4].False-negative SAT may be caused by the presence of blocking antibodies in the α-globulin (IgG) fractions.[22]

Dipstick assays are new and promising, based on the binding of Brucella IgM antibodies, and are simple, accurate, and rapid. ELISA typically uses cytoplasmic proteins as antigens. It measures IgM, IgG, and IgA with better sensitivity and specificity than the SAT in most recent comparative studies.[23] The commercial Brucellacapt test, a single-step immunocapture assay for the detection of total anti-Brucella antibodies, is an increasingly used adjunctive test when resources permit. PCR is fast and should be specific. Many varieties of PCR have been developed (e.g. nested PCR, realtime PCR, and PCR-ELISA) and found to have superior specificity and sensitivity in detecting both primary infection and relapse after treatment.[24]

Other laboratory findings include normal peripheral white cell count, and occasional leucopenia with relative lymphocytosis. The serum biochemical profiles are commonly normal.[25]

Prevention

Surveillance using serological tests, as well as tests on milk such as the milk ring test, can be used for screening and play an important role in campaigns to eliminate the disease. Also, individual animal testing both for trade and for disease-control purposes is practiced. In endemic areas, vaccination is often used to reduce the incidence of infection. As the disease is closer to being eliminated, a test and eradication program is required to completely eliminate it.The main way of preventing brucellosis is by using fastidious hygiene in producing raw milk products, or by pasteurizing all milk that is to be ingested by human beings, either in its unaltered form or as a derivative, such as cheese.[26][27]

Treatment

Tetracycline

Antibiotics such as tetracyclines, doxycycline, and the aminoglycosides streptomycin and gentamicin are effective against Brucella bacteria. However, the use of more than one antibiotic is needed for several weeks.[28][12].

The gold standard treatment for adults is daily intramuscular injections of streptomycin 1 g for 14 days and oral doxycycline 100 mg twice daily for 45 days (concurrently). Gentamicin 5 mg/kg by intramuscular injection once daily for 7 days is an acceptable substitute when streptomycin is not available or contraindicated.[29] Another widely used regimen is doxycycline plus rifampin twice daily for at least 6 weeks. This regimen has the advantage of oral administration. A triple therapy of doxycycline, with rifampin and co-trimoxazole, has been used successfully to treat neurobrucellosis.[30] Doxycycline plus streptomycin regimen (for 2 to 3 weeks) is more effective than doxycycline plus rifampicin regimen (for 6 weeks).[31]

Doxycycline is able to cross the blood–brain barrier, but requires the addition of two other drugs to prevent relapse. [32][33][34] In brucellic endocarditis, surgery is required for an optimal outcome.[35]

Prognosis

The mortality of the disease is low. The most frequent cause of death was endocarditis. Recent advances in antibiotics and surgery have been successful in preventing death due to endocarditis. Prevention of human brucellosis can be achieved by eradication of the disease in animals by vaccination and other veterinary control methods such as testing herds/flocks and slaughtering animals when infection is present. Currently, no effective vaccine is available for humans. Boiling milk before consumption, or before using it to produce other dairy products, is protective against transmission via ingestion.[36][12][35]

Patients who have had brucellosis should probably be excluded indefinitely from donating blood or organs. Exposure of diagnostic laboratory personnel to Brucella organisms remains a problem in both endemic settings and when brucellosis is unknowingly imported by a patient.[37] After appropriate risk assessment, staff with significant exposure should be offered postexposure prophylaxis and followed up serologically for 6 months.[38] Recently published experience confirms that prolonged and frequent serological follow-up consumes significant resources without yielding much information, and is burdensome for the affected staff, who often fail to comply. The side effects of the usual recommended regimen of rifampicin and doxycycline for 3 weeks also reduces treatment adherence. As no evidence shows treatment with two drugs is superior to monotherapy, British guidelines now recommend doxycycline alone for 3 weeks and a less onerous follow-up protocol.[39]

Epidemiology

New cases of brucellosis per million people as of 2006.[40]

Argentina

According to a study published in 2002, an estimated 10–13% of farm animals are infected with Brucella species.[41] Annual losses from the disease were calculated at around $60 million. Since 1932, government agencies have undertaken efforts to contain the disease. Currently, all cattle of ages 3–8 months must receive the Brucella abortus strain 19 vaccine.[42]

Australia

Australia is free of cattle brucellosis, although it occurred in the past. Brucellosis of sheep or goats has never been reported. Brucellosis of pigs does occur. Feral pigs are the typical source of human infections.[43][44]

Canada

On 19 September 1985, the Canadian government declared its cattle population brucellosis-free. Brucellosis ring testing of milk and cream, and testing of cattle to be slaughtered ended on 1 April 1999. Monitoring continues through testing at auction markets, through standard disease-reporting procedures, and through testing of cattle being qualified for export to countries other than the United States.[45]

China

Historically speaking the infection was first detected in this country in 1905.[46]

An outbreak infecting humans took place in Lanzhou in 2020 after the Lanzhou Biopharmaceutical Plant, which was involved in vaccine production, accidentally pumped out the bacteria into the atmosphere in exhaust air due to use of expired disinfectant. The outbreak affected over 6,000 people.[47][48]

Disease incidence map of B. melitensis infections in animals in Europe during the first half of 2006
  never reported
  not reported in this period
  confirmed clinical disease
  confirmed infection
  no information

Malta

Until the early 20th century, the disease was endemic in Malta to the point of it being referred to as "Maltese fever". Since 2005, due to a strict regimen of certification of milk animals and widespread use of pasteurization, the illness has been eradicated from Malta.[49]

Republic of Ireland

Ireland was declared free of brucellosis on 1 July 2009. The disease had troubled the country's farmers and veterinarians for several decades.[50][51] The Irish government submitted an application to the European Commission, which verified that Ireland had been liberated.[51] Brendan Smith, Ireland's then Minister for Agriculture, Food and the Marine, said the elimination of brucellosis was "a landmark in the history of disease eradication in Ireland".[50][51] Ireland's Department of Agriculture, Food and the Marine intends to reduce its brucellosis eradication programme now that eradication has been confirmed.[50][51]

UK

Mainland Britain has been free of brucellosis since 1979, although there have been episodic re-introductions since.[52] The last outbreak of brucellosis in Great Britain was in cattle in Cornwall in 2004.[52][53] Northern Ireland was declared officially brucellosis-free in 2015.[52]

New Zealand

Brucellosis in New Zealand is limited to sheep (B. ovis). The country is free of all other species of Brucella.[54]

United States

Cases of brucellosis in humans in the United States from the years 1993–2010[55]

Dairy herds in the USA are tested at least once a year to be certified brucellosis-free.[56] with the Brucella milk ring test.[57]

Cows confirmed to be infected are often killed. This vaccination is usually referred to as a "calfhood" vaccination. Most cattle receive a tattoo in one of their ears, serving as proof of their vaccination status. This tattoo also includes the last digit of the year they were born.[58]

The first state–federal cooperative efforts towards eradication of brucellosis caused by B. abortus in the U.S. began in 1934.[59]

Brucellosis was originally imported to North America with non-native domestic cattle (Bos taurus), which transmitted the disease to wild bison (Bison bison) and elk (Cervus canadensis). No records exist of brucellosis in ungulates native to America until the early 19th century.[60]

History

Brucellosis first came to the attention of British medical officers in the 1850s in Malta during the Crimean War, and was referred to as Malta Fever. Jeffery Allen Marston (1831–1911) described his own case of the disease in 1861. The causal relationship between organism and disease was first established in 1887 by David Bruce.[61][62] In 1897, Danish veterinarian Bernhard Bang isolated a bacillus as the agent of heightened spontaneous abortion in cows.[63]

Maltese scientist and archaeologist Themistocles Zammit identified unpasteurized goat milk as the major etiologic factor of undulant fever in June 1905.[64]

In the late 1910s, American bacteriologist Alice C. Evans was studying the Bang bacillus and gradually realized that it was virtually indistinguishable from the Bruce coccus.[65] The short-rod versus oblong-round morphologic borderline explained the leveling of the erstwhile bacillus/coccus distinction (that is, these "two" pathogens were not a coccus versus a bacillus but rather were one coccobacillus).[65] The Bang bacillus was already known to be enzootic in American dairy cattle, which showed itself in the regularity with which herds experienced contagious abortion.[65] Having made the discovery that the bacteria were certainly nearly identical and perhaps totally so, Evans then wondered why Malta fever was not widely diagnosed or reported in the United States.[65] She began to wonder whether many cases of vaguely defined febrile illnesses were in fact caused by the drinking of raw (unpasteurized) milk.[65] During the 1920s, this hypothesis was vindicated. Such illnesses ranged from undiagnosed and untreated gastrointestinal upset to misdiagnosed[65] febrile and painful versions, some even fatal. This advance in bacteriological science sparked extensive changes in the American dairy industry to improve food safety. The changes included making pasteurization standard and greatly tightening the standards of cleanliness in milkhouses on dairy farms. The expense prompted delay and skepticism in the industry,[65] but the new hygiene rules eventually became the norm.

In the decades after Evans's work, this genus, which received the name Brucella in honor of Bruce, was found to contain several species with varying virulence. The name "brucellosis" gradually replaced the 19th-century names Mediterranean fever and Malta fever.[66]

In 1989, neurologists in Saudi Arabia discovered "neurobrucellosis", a neurological involvement in brucellosis.[67][68]

These obsolete names have previously been applied to brucellosis:[66][69]

  • Crimean fever
  • Cyprus fever
  • Gibraltar fever
  • Goat fever
  • Italian fever
  • Neapolitan fever
  • David Bruce (centre), with members of the Mediterranean Fever Commission (Brucellosis)
    David Bruce (centre), with members of the Mediterranean Fever Commission (Brucellosis)
  • The lab in which Sir Themistocles Zammit and the Mediterranean Fever Commission carried out research about brucellosis from 1904 to 1906 is located within the Castellania in Valletta, Malta.
    The lab in which Sir Themistocles Zammit and the Mediterranean Fever Commission carried out research about brucellosis from 1904 to 1906 is located within the Castellania in Valletta, Malta.

Biological warfare

Brucella species were weaponized by several advanced countries by the mid-20th century. In 1954, B. suis became the first agent weaponized by the United States at its Pine Bluff Arsenal near Pine Bluff, Arkansas. Brucella species survive well in aerosols and resist drying. Brucella and all other remaining biological weapons in the U.S. arsenal were destroyed in 1971–72 when the American offensive biological warfare program was discontinued by order of President Richard Nixon.[70]

Agent US was in advanced development by the end of World War II. When the United States Air Force (USAF) wanted a biological warfare capability, the Chemical Corps offered Agent US. Though the capability was developed, operational testing indicated the weapon was less than desirable, and the USAF designed it as an interim capability until it could eventually be replaced by a more effective biological weapon.[71][12]

Other animals

Species infecting domestic livestock are B. abortus (cattle), B. canis (dogs), B. melitensis (goats and sheep), B. ovis (sheep), and B. suis ( pigs).[72]

Cattle

B. abortus is the principal cause of brucellosis in cattle. The bacteria are shed from an infected animal at or around the time of calving or abortion. Once exposed, the likelihood of an animal becoming infected is variable, depending on age, pregnancy status, and other intrinsic factors of the animal, as well as the number of bacteria to which the animal was exposed.[73] The most common clinical signs of cattle infected with B. abortus are high incidences of abortions, arthritic joints, and retained placenta.[74][26]

Dogs

The causative agent of brucellosis in dogs, B. canis, is transmitted to other dogs through breeding and contact with aborted fetuses. Brucellosis can occur in humans who come in contact with infected aborted tissue or semen. The bacteria in dogs normally infect the genitals and lymphatic system, but can also spread to the eyes, kidneys, and intervertebral discs. Brucellosis in the intervertebral disc is one possible cause of discospondylitis. Symptoms of brucellosis in dogs include abortion in female dogs and scrotal inflammation and orchitis in males. Fever is uncommon. Infection of the eye can cause uveitis, and infection of the intervertebral disc can cause pain or weakness. Blood testing of the dogs prior to breeding can prevent the spread of this disease. It is treated with antibiotics, as with humans, but it is difficult to cure.[75]

Aquatic wildlife

Brucellosis in cetaceans is caused by the bacterium B. ceti. First discovered in the aborted fetus of a bottlenose dolphin, the structure of B. ceti is similar to Brucella in land animals. B. ceti is commonly detected in two suborders of cetaceans, the Mysticeti and Odontoceti. The Mysticeti include four families of baleen whales, filter-feeders, and the Odontoceti include two families of toothed cetaceans ranging from dolphins to sperm whales. B. ceti is believed to transfer from animal to animal through sexual intercourse, maternal feeding, aborted fetuses, placental issues, from mother to fetus, or through fish reservoirs. Brucellosis is a reproductive disease, so has an extreme negative impact on the population dynamics of a species. This becomes a greater issue when the already low population numbers of cetaceans are taken into consideration. B. ceti has been identified in four of the 14 cetacean families, but the antibodies have been detected in seven of the families. This indicates that B. ceti is common amongst cetacean families and populations. Only a small percentage of exposed individuals become ill or die. However, particular species apparently are more likely to become infected by B. ceti. The harbor porpoise, striped dolphin, white-sided dolphin, bottlenose dolphin, and common dolphin have the highest frequency of infection amongst ondontocetes. In the mysticetes families, the northern minke whale is by far the most infected species. Dolphins and porpoises are more likely to be infected than cetaceans such as whales. With regard to sex and age biases, the infections do not seem influenced by the age or sex of an individual. Although fatal to cetaceans, B. ceti has a low infection rate for humans.[76]

Terrestrial wildlife

Elk

The disease in its various strains can infect multiple wildlife species, including elk (Cervus canadensis), bison (Bison bison), African buffalo (Syncerus caffer), European wild boar (Sus scrofa), caribou (Rangifer tarandus), moose (Alces alces), and marine mammals .[77][78] While some regions use vaccines to prevent the spread of brucellosis between infected and uninfected wildlife populations, no suitable brucellosis vaccine for terrestrial wildlife has been developed.[79] This gap in medicinal knowledge creates more pressure for management practices that reduce spread of the disease.[79]

Wild bison and elk in the greater Yellowstone area are the last remaining reservoir of B. abortus in the US. The recent transmission of brucellosis from elk back to cattle in Idaho and Wyoming illustrates how the area, as the last remaining reservoir in the United States, may adversely affect the livestock industry. Eliminating brucellosis from this area is a challenge, as many viewpoints exist on how to manage diseased wildlife. However, the Wyoming Game and Fish Department has recently begun to protect scavengers (particularly coyotes and red fox) on elk feedgrounds, because they act as sustainable, no-cost, biological control agents by removing infected elk fetuses quickly.[80] Purebred bison in the Henry Mountains of southern Utah are free of brucellosis.[81]

The National Elk Refuge in Jackson, Wyoming asserts that the intensity of the winter feeding program affects the spread of brucellosis more than the population size of elk and bison.[77] Since concentrating animals around food plots accelerates spread of the disease, management strategies to reduce herd density and increase dispersion could limit its spread.[77]

Effects on hunters

Hunters may be at additional risk for exposure to brucellosis due to increased contact with susceptible wildlife, including predators that may have fed on infected prey. Hunting dogs can also be at risk of infection.[82] Exposure can occur through contact with open wounds or by directly inhaling the bacteria while cleaning game.[83] In some cases, consumption of undercooked game can result in exposure to the disease.[83] Hunters can limit exposure while cleaning game through the use of precautionary barriers, including gloves and masks, and by washing tools rigorously after use.[79][84] By ensuring that game is cooked thoroughly, hunters can protect themselves and others from ingesting the disease.[83]

See also

References

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