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Microbiology

Bunyaviruses (Hemorrhagic Fevers, Hantaviruses)

4 topics with concise reviews: definitions, key facts, and class questions.

This section is dedicated to viruses causing severe mass and zoonotic (natural focal) diseases. The focus is on the family Bunyaviridae, whose members are infamous for causing hemorrhagic fevers with high mortality.

The materials cover the general characteristics of bunyaviruses, a detailed study of the pathogenesis of Crimean-Congo hemorrhagic fever and hantaviruses (pathogens of hemorrhagic fever with renal syndrome, HFRS). In addition, this module includes rotavirus infection—the main culprit of severe viral diarrhea in children. Although rotaviruses belong to the family Reoviridae, in the educational process they are often studied alongside other segmented RNA genome viruses.

During classes and exams, you will certainly be asked about transmission routes: while for hantaviruses these are murine rodents, for Crimean-Congo fever they are ticks. Furthermore, instructors love questions about the fragmented genome (and associated genetic reassortment) and rapid diagnostic methods. Learn the infection reservoirs, mechanisms of hemorrhagic syndrome development, and dehydration—this is the foundation for passing successfully!

Section Topics

Frequently asked questions for this section

Which viral protein is responsible for the development of diarrhea?

A key pathogenicity factor is the non-structural protein NSP4. It acts as an enterotoxin, which directly causes secretory diarrhea.

Which method is primary for biological virus isolation?

Intracerebral inoculation of newborn white mice, as they are most susceptible to the infection.

Why is the contact transmission route of CCHF considered the most dangerous?

During human-to-human transmission, the "ping-pong" effect occurs—a multiple increase in pathogen virulence after its passage through the macroorganism. Because of this, contact cases (including nosocomial ones) are extremely severe, with a mortality rate of up to 50%.

Can one contract a hantavirus infection from an infected person?

No, an infected person is a biological dead end for the virus and poses no epidemiological danger to others.

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