RESUMO
The genetic diversity and antibiotic resistance profiles of 38 Streptococcus equi subsp. zooepidemicus isolates were determined from a kennelled canine population during two outbreaks of hemorrhagic pneumonia (1999 to 2002 and 2007 to 2010). Analysis of the szp gene hypervariable region and the 16S-23S rRNA intergenic spacer region and multilocus sequence typing (MLST) indicated a predominant tetO-positive, doxycycline-resistant ST-10 strain during 1999 to 2002 and a predominant tetM-positive doxycycline-resistant ST-62 strain during 2007 to 2010.
Assuntos
Doenças do Cão/microbiologia , Doxiciclina/farmacologia , Farmacorresistência Bacteriana , Variação Genética , Pneumonia Bacteriana/veterinária , Infecções Estreptocócicas/veterinária , Streptococcus equi/efeitos dos fármacos , Animais , Antibacterianos/farmacologia , Antígenos de Bactérias/genética , Proteínas de Bactérias/genética , DNA Espaçador Ribossômico/genética , Surtos de Doenças , Doenças do Cão/epidemiologia , Cães , Testes de Sensibilidade Microbiana , Tipagem de Sequências Multilocus , Pneumonia Bacteriana/epidemiologia , Pneumonia Bacteriana/microbiologia , Infecções Estreptocócicas/epidemiologia , Infecções Estreptocócicas/microbiologia , Streptococcus equi/classificação , Streptococcus equi/genética , Streptococcus equi/isolamento & purificaçãoRESUMO
Chromobacterium violaceum is a saprophyte of soil and water in tropical and subtropical environments that is associated with rare but highly fatal infections in animals and humans. Systemic infection was diagnosed in two critically ill dogs from Florida. Fever was absent in both dogs. Both dogs were treated surgically and provided with intensive care, but only one survived. The identification of characteristic, violet-pigmented bacterial colonies on routine microbial cultures should alert microbiologists and clinicians to the likelihood of this dangerous pathogen. Because of the rapidly progressive nature of this infection, empirical antibiotic administration with fluoroquinolones should be employed pending susceptibility testing.