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Ehrlichia chaffeensis and E. ewingii are tickborne intracellular bacteria that cause human ehrlichiosis (1). In the United States, ehrlichiosis occurs primarily in south-central, southeastern, and mid-Atlantic states. In 2019, nearly [...]

Rocky Mountain spotted fever (RMSF) is the deadliest tickborne disease in the Western Hemisphere. RMSF is caused by the bacterium Rickettsia rickettsii, which is primarily transmitted to humans by Dermacentor [...]

Bacterial zoonoses cause severe febrile illness in East Africa (2). Patients with bacterial zoonotic diseases can have nonspecific febrile illnesses that are difficult to diagnose clinically or in the laboratory [...]

Zoonoses account for 61% of human infectious diseases and 75% of emerging pathogens (1). Zoonotic diseases pass from animals to humans through direct contact with animals, inhalation of infectious aerosols, [...]

Ehrlichiosis and anaplasmosis are emerging tickborne zoonoses caused by Ehrlichia spp. and Anaplasma phagocytophilum, respectively (1-4). These gram-negative obligate intracellular bacteria infect leukocytes and cause febrile illness in humans (1,3). [...]

Thin section and negative stain electron microscopy (EM) examination of viruses grown in cultured cells have been instrumental in determining an etiologic agent in numerous disease outbreaks caused by previously [...]

Rickettsia parkeri, a tick-borne bacterium discovered in 1937, was considered nonpathogenic until 2004. Since 2004, >25 cases of R. parkeri rickettsiosis have been reported in persons living within the recognized [...]

Bourbon virus (BRBV) was first isolated from a febrile patient with a history of tick bites in Bourbon County, Kansas, USA; the patient later died from severe illness in 2014 [...]

Murine typhus, also known as endemic or flea-borne typhus, is caused by Rickettsia typhi, a gram-negative, obligate intracellular bacillus. This zoonotic disease is primarily maintained in rodent-flea cycles and is [...]

Sylvatic epidemic typhus, hereafter referred to as sylvatic typhus, is a rare but potentially lethal zoonotic exanthematous disease caused by Rickettsia prowazekii. It is associated with a cycle of infection [...]

Using PCR in conjunction with pre-enrichment culture, we detected Bartonella henselae and B. vinsonii subspecies berkhoffii in the blood of 14 immunocompetent persons who had frequent animal contact and arthropod [...]

Scrub typhus, caused by Orientia tsutsugamushi, is a severe febrile illness transmitted to humans by trombiculid mites, which normally feed on rodents. The first known outbreak of scrub typhus in [...]

In March 2002, typhus fever was diagnosed in two patients residing in West Virginia and Georgia. Both patients were hospitalized with severe febrile illnesses, and both had been recently exposed [...]

This issue of Emerging Infectious Diseases contains 2 independent reports of Rickettsia sibirica infections in Spain and Portugal. The authors identify the agent both as a subspecies (1) and as [...]