History of discovery and pathogen properties
This microorganism was first identified in West Germany, in the city of Marburg. The discovery resulted from a large-scale intralaboratory outbreak of infection among staff members. It was found that the source of infection was imported African green monkeys, whose tissues the personnel handled.
In laboratory conditions, the pathogen is successfully cultivated in cell cultures. However, it is important to note that a specific cytopathic effect (CPE) may be completely absent, requiring special approaches for virus detection.
Epidemiological features
The natural reservoir of the infection includes bats and African green monkeys. The human population has an extremely high susceptibility to this infectious agent. The incidence is most commonly sporadic, manifesting as isolated local outbreaks or cases of laboratory-acquired infection.
The virus is transmitted via two main routes:
- Contact route: through direct interaction with the infected blood of patients or primates.
- Airborne droplet route: through close contact with the source of infection.
Clinical presentation and disease course
The latent (incubation) period varies widely, ranging from 2 to 19 days. The disease manifests very acutely: patients complain of a sharp rise in body temperature and a pronounced general malaise.
In the initial period, the virus actively affects the respiratory system and gastrointestinal tract. As the infection progresses, by days 5–7, the peak stage sets in. It is characterized by severe manifestations: a specific hemorrhagic rash appears on the skin, and profuse bloody diarrhea develops. The prognosis is extremely grave—the mortality rate is 50%.
Briefly: answers to topical questions
To which family and genus does the Marburg virus belong?
Marburg virus belongs to the family Filoviridae. Within the family, the taxonomy of the pathogen is represented by two classification variants depending on the source:
- Genus (Marburgvirus) — distinguished as one of the two key genera of the family.
- Genus (Filovirus) — also indicated as the genus affiliation of the Marburg virus.
What is the morphology and structure of the Marburg virus virion?
Marburg virions are characterized by a distinct filamentous morphology, which is historically reflected in the etymology of their family name (from the Latin word meaning "thread"). Regarding its genetic material structure, this pathogen belongs to Group V of the Baltimore classification. Its viral genome is represented by a negative-sense single-stranded RNA molecule ((-)ssRNA).
What laboratory diagnostic methods are used to confirm Marburg virus infection?
To laboratory-confirm the infection, methods aimed at detecting viral components and antibodies are used:
- RT-PCR — reverse transcription polymerase chain reaction;
- IFA — immunofluorescence assay;
- ELISA — enzyme-linked immunosorbent assay.
The basis of diagnosis is clinical and epidemiological data.
What drugs are used for etiotropic treatment of Marburg fever?
For the treatment of Marburg fever, the following are used:
- Convalescent plasma — plasma from recovered patients;
- Interferon preparations.
Are there vaccines for the specific prevention of Marburg fever?
Yes, a killed vaccine has been developed for specific prophylaxis. It is used for medical personnel in foci and when working with filoviruses.
To memorize the transmission routes and reservoir, use the mnemonic: "Monkey in Marburg Coughed Blood" (Marburg, Monkeys — reservoir, Contact/blood and airborne routes).
Class and exam questions
Where and how was this virus first isolated?
The pathogen was first described in the German city of Marburg following the infection of laboratory personnel who had been in contact with African green monkeys.
How does the cytopathic effect manifest during cultivation?
When the virus propagates in cell culture, a characteristic cytopathic effect (CPE) may be completely absent.
What are the main clinical signs during the peak period?
On days 5–7 of the disease, a pronounced hemorrhagic syndrome develops: a skin rash and bloody diarrhea appear.
How high is the mortality rate for this infection?
Marburg hemorrhagic fever is characterized by a severe course; mortality among infected individuals is 50%.
What else to study on this topic
- Mechanisms of hemorrhagic syndrome development
- Specifics of working with particularly dangerous infections in the laboratory
- Methods of virus cultivation in the absence of visible CPE
- The role of bats as a natural reservoir of zoonotic infections
- Differential diagnosis of hemorrhagic fevers
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