Cell-to-Cell Spread and Latency as Persistence Strategies | AI Learning Guide

Think about why a virus would bother with these two strategies. If it releases free particles, antibodies can bind them before they reach a new cell. Direct cell-to-cell spread avoids that by passing the infection across a contact zone, so the particle is never exposed. Latency avoids detection a different way: the genome stays in the cell but makes almost no protein, so the immune system has nothing to see. The trade-off is that latency does not clear the virus. It hides it, and the hidden genome can reactivate later. That is the reservoir problem.

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Two ways to avoid the extracellular space

Direct cell-to-cell spread keeps the infection local and shielded from antibodies, while latency keeps viral protein production so low that immune recognition is minimal. Both allow the virus to persist when free virions would be cleared.

Latency is not clearance

A latent genome is still present and can reactivate. This is why infections such as herpes simplex or HIV establish lifelong reservoirs that current treatments suppress but do not eliminate.