In what environment or system are viruses successfully cultured? _______________?
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Answer: D. Embryonated egg
Explanation
Embryonated chicken eggs provide a living cellular environment that supports viral replication. Many human and animal viruses successfully propagate within specific tissues of developing chick embryos. This biological system offers sterile living cells without requiring complex mammalian tissue culture setups. Viruses are obligate intracellular parasites that cannot replicate outside of a living host cell. Different viral strains prefer distinct anatomical regions of the egg, such as the allantoic cavity. Embryonated eggs have historically been crucial for vaccine manufacturing and virological research.
Egg-based culture systems remain essential for producing large quantities of influenza vaccines annually. Diagnostic virology laboratories utilize these methods when cell culture facilities are unavailable. Understanding host requirements helps researchers propagate emerging viral pathogens for scientific study. Sabouraud agar is a solid growth medium formulated specifically for isolating fungi and yeasts. Rogosa medium is a selective formulation used primarily for cultivating oral lactobacilli bacteria. Nonembryonated eggs lack the living embryonic tissues required to support viral replication processes.
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