5 topics with brief reviews: definitions, key facts, and class questions.
In this section, we examine the Paramyxoviridae family — RNA viruses that predominantly affect the respiratory tract and are frequent causes of classic childhood infections, though they can also cause severe disease in adults.
Here we have gathered materials on the general characteristics of paramyxoviruses along with detailed breakdowns of the main representatives: parainfluenza viruses, mumps virus, measles virus, and respiratory syncytial virus (RSV). We will analyze their morphology, virulence factors, pathogenesis, laboratory diagnostic methods, and the principles of specific prophylaxis.
In microbiology classes and exams, you are most frequently asked about the differences between paramyxoviruses and orthomyxoviruses (influenza viruses), the mechanism of syncytium formation (giant multinucleated cells), and vaccination principles (MMR). Pay special attention to surface glycoproteins (HN, H, G, and F proteins) — knowing their functions will definitely save you during oral questioning.
A syncytium is a multinucleated structure formed by the fusion of adjacent cells. In paramyxoviruses, this occurs due to the activity of the viral F protein (fusion protein) on the membranes of infected cells.
Can you get infected with parainfluenza again?
Yes. Post-infection immunity is fragile, short-lived, and strictly typespecific, making reinfection possible even with the same virus types.
Why is the mumps vaccine administered using only a single strain?
The mumps virus has only one serotype, so there is no need to develop multivalent vaccines.
What is the pathognomonic symptom of measles?
These are Koplik spots (Belsky–Filatov–Koplik spots) — small whitish-gray spots with a red halo on the buccal mucosa that appear a day before the skin rash.
Why is the virus called "syncytial"?
The virus got its name from its characteristic cytopathic effect. In cell culture, it causes the membranes of adjacent infected cells to fuse, forming giant multinucleated structures — symplasts and syncytia.
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