Occupational Infection to Brucella Abortus B19 Vaccine Despite Antimicrobial Prophylaxis
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ORIGINAL ARTICLE Occupational infection to Brucella abortus B19 vaccine despite antimicrobial prophylaxis Infecção ocupacional pela cepa vacinal de Brucella abortus B19 apesar de profilaxia antimicrobiana Alexandre Sampaio Moura1 , Letícia Mattos Menezes2 , Marcelle Amaral de Matos3 , Cynthya Magalhães Costa3 , Bruna Arantes Borges3 ABSTRACT The authors report the case of a veterinarian who acquired brucellosis infection by accidental exposure to Brucella abortus vaccine (BRUCEL-VET B19) while performing animal vaccination. Antibiotic prophylaxis with doxycycline and rifampin for six weeks was indicated, but rifampin was discontinued after 10 days due to gastrointestinal in- tolerance. Despite prophylaxis, the patient seroconverted after 30 days, but was asymptomatic and did not require additional antibiotic therapy. Post-exposure prophylaxis of Brucella is not free from side effects and asymptomatic seroconversion can occur despite prophylaxis. Keywords: Brucellosis; Occupational Exposure; Post-Exposure Prophylaxis. RESUMO Os autores relatam o caso de um veterinário que adquiriu infecção por brucelose por exposição acidental à vacina Brucellaabortus (BRUCEL-VET B19) durante a vacinação animal. A profilaxia antibiótica com doxiciclina e rifampici- na por seis semanas foi indicada, mas a rifampicina foi descontinuada após 10 dias devido à intolerância gastroin- testinal. A profilaxia pós-exposição de Brucella não está isenta de efeitos colaterais e a soroconversãoassintomática pode ocorrer apesar da profilaxia. Palavras-chave: Brucelose; Exposição Ocupacional; Profilaxia Pós-Exposição. INTRODUCTION in about 20 to 30% of the cases1,3. There is fre- quent involvement of bones and joints resulting in Brucellosis is a bacterial zoonosis responsible focal complications such as sacroiliitis, spondylitis, for more than half a million new human cases annu- peripheral arthritis and osteomyelitis1. The most ally, mainly in developing countries1. Ingestion of serious complication is infectious endocarditis contaminated food and occupational contact remain that occurs in 1% of the cases and is responsible the major sources of infection, and accidental expo- for most of the 5% mortality rate of human bru- sure rarely results in human brucellosis2. cellosis1,3. Blood culture is the gold standard for Fever, sweating, arthralgia and myalgia diagnosing brucellosis, but serological tests are are common clinical manifestations in brucellosis also very useful1. Rose Bengal test (a rapid slide- with hepatomegaly and splenomegaly occurring type agglutination assay) is commonly used as a 1 Doctor, Hospital Eduardo de Menezes. Department of Infectious Diseases, Belo Horizonte (MG), Brasil. 2 Medical resident, Hospital Eduardo de Menezes. Department of Infectious Diseases, Belo Horizonte (MG), Brasil. 3 Graduate student, Universidade José do Rosário Vellano, Belo Horizonte (MG), Brasil. https://doi.org/10.11606/issn.2176-7262.rmrp.2021.168000 Medicina (Ribeirão Preto) 2021;54(1):e-168000 Moura AS, Menezes LM, Matos MA, Costa CM, et al screening test and positive results are confirmed Five days after beginning PEP, the patient by the serum agglutination test4. sought medical attention complaining of nausea, Enzyme-Linked Immunosorbent Assay epigastralgia, myalgia and headache, which he (ELISA) has become more commonly used and it attributed to the medications. The patient was seems to have good sensitivity but lower specificity advised to take the medications with food to avoid compared to agglutination tests1. Polymerase chain gastrointestinal distress and suspend rifampin if reaction (PCR) tests also have high sensitivity, but there was no improvement. After 7 days of use, the their higher costs limit their use in clinical practice5. patient discontinued rifampin with complete resolu- Treatment of brucellosis requires the use of tion of gastrointestinal symptoms and maintained at least two drugs and the most effective dual com- doxycycline as prescribed for 42 days. The patient bination seems to be a tetracycline (doxycycline or was asymptomatic at the end of the prophylaxis but tetracycline) with an aminoglycoside (gentamycin showed seroconversion (IgM 43 U/ml - cut-off value: or streptomycin)6. Rifampicin may be used in com- 20 U/ml; IgG 47 U/ml - cut-off value 30 U/ml). bination with doxycycline as an alternative treat- Conventional blood culture with prolonged incuba- ment6,7. Regarding prevention, effective vaccines tion time (30 days) was performed (three samples), are only available for cattle and goats. In Brazil, which showed no bacterial growth. Polymerase the National Program for Control and Eradication chain reaction for Brucella was not available. During of Brucellosis / Animal Tuberculosis (PNCEBT) was the 6-month follow-up period the patient remained established in 2001 and recommended vaccina- asymptomatic. This study was approved by the tion of female bovine animals with B19 vaccine8. Hospital Eduardo de Menezes Institutional Review This vaccine contains live-attenuated strains of Board (protocol number 3.847.964). The require- Brucella abortus. Therefore, accidental exposure ment for the investigator to obtain a signed consent poses a potential risk for human infection8-10. This form was waived by the IRB. risk of infection seems to be low but appropriate post-exposure prophylaxis is recommended11. Here, we report on a case of accidental exposure DISCUSSION to brucellosis vaccine with seroconversion despite prophylaxis. Brucella abortus (strain B19) vaccine is part of the mandatory sanitary measures recom- mended by the National Program for Control and CASE REPORT Eradication of Brucellosis and Animal Tuberculosis in Brazil, and the reported patient was exposed while A 28-year-old male, veterinarian, presented routinely vaccinating cattle. Accidents during the to an infectious disease clinic with a history of per- administration of live attenuated brucellosis vac- foration of the left hand while vaccinating cattle cines with dermal inoculation are of high risk for 12 hours earlier. The vaccine involved in the expo- human infection and post-exposure prophylaxis is sure was BRUCEL-VET, a lyophilized suspension of indicated9-11. In the medical literature there are few live germs of Brucella abortus (sample B19). The studies describing the outcome of accidental expo- patient was asymptomatic. Previous medical his- sure to brucellosis vaccine. In a series of 26 cases tory included the use of pantoprazole (40 mg/d) exposed to Brucella abortus (strain RB51) vaccine, for treatment of epigastric pain two months 81% were associated with needlestick injury, 15% before. The vaccination schedule was complete. with conjunctival spray exposure and 4% reported A regimen of doxycycline (100 mg twice a day) direct contact with an open wound, and at least and rifampin (600 mg once a day) for 42 days was one systemic symptom was reported by 73% of the prescribed for post-exposure prophylaxis (PEP). exposed workers12. Baseline ELISA immunoglobulin (Ig) serology for The need for post-exposure prophylaxis is Brucella was non-reactive (5 U/ml; cut-off value: called into question by studies that show a low 30 U/ml) and liver and renal profile were within rate of active brucellosis (0 to 2%) in laboratory normal range. employees exposed to B. melitensis even among Medicina (Ribeirão Preto) 2021;54(1):e-168000 7 Occupational exposure Brucellosis those not receiving PEP2. Since PEP may be asso- evidence on how to proceed. The different recom- ciated with side effects, more research is needed mendations for the management of brucella expo- to assess the potential effectiveness of PEP after sure reinforce the need for more studies. In our brucellosis exposure. experience, we have observed that PEP is not In Brazil, there are two different recom- free from side effects, and a risk-benefit analy- mendations for PEP after accidental exposure to sis should be considered. In our reported case, Brucellosis. The Santa Catarina State Protocol early use of antibiotics may have been beneficial for Surveillance and Clinical Management of as seroconversion suggests that the patient was Human Brucellosis11 proposes a more conserva- indeed infected, and we expect that the combi- tive approach and does not recommend antimi- nation of doxycycline and rifampin may prevent crobial prophylaxis after percutaneous exposure to future complications. Our study is relevant to the vaccine. It recommends following up with the public health in the interface between human and exposed patient for 2 years in a reference medical animal health.The vaccination is an important pre- center where non-specific laboratory tests should ventive measure against bovine brucellosis, but be performed (aminotransferases and inflamma- accidental human exposure to the vaccine strain tion blood tests). Treatment is recommended for can bring serious health problems. The reported patients presenting brucellosis-related symptoms case contributes to a better understanding of the or with altered blood tests. On the other hand, the subject by showing that prophylaxis can prevent Paraná State Protocol9 recommends immediate PEP the disease, but does not prevent infection from for occupational exposures to Brucella vaccine, occurring. The risk of future reactivation of the regardless of the strain. For needlestick injuries, microorganism in those exposed to the vaccine the protocol recommends the use of doxycycline strain should be assessed with long-term follow- 100 mg twice a day for 42 days. In the United -up