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> They analyze the presence of certain proteins:
> 
> https://phys.org/news/2022-09-viruses-eyes-ears.html
> 
> "New UMBC-led research in Frontiers in Microbiology suggests that viruses are using information from their environment to "decide" when to sit tight inside their hosts and when to multiply and burst out, killing the host cell. The work has implications for antiviral drug development.
> 
> "A virus's ability to sense its environment, including elements produced by its host, adds "another layer of complexity to the viral-host interaction," says Ivan Erill, professor of biological sciences and senior author on the new paper. 
> 
> "The new study focused on bacteriophages—viruses that infect bacteria, often referred to simply as "phages." The phages in the study can only infect their hosts when the bacterial cells have special appendages, called pili and flagella, that help the bacteria move and mate. The bacteria produce a protein called CtrA that controls when they generate these appendages. The new paper shows that many appendage-dependent phages have patterns in their DNA where the CtrA protein can attach, called binding sites. A phage having a binding site for a protein produced by its host is unusual, Erill says.
> 
> "Even more surprising, Erill and the paper's first author Elia Mascolo, a Ph.D. student in Erill's lab, found through detailed genomic analysis that these binding sites were not unique to a single phage, or even a single group of phages. Many different types of phages had CtrA binding sites—but they all required their hosts to have pili and/or flagella to infect them. It couldn't be a coincidence, they decided.
> 
> "The ability to monitor CtrA levels "has been invented multiple times throughout evolution by different phages that infect different bacteria," Erill says. When distantly related species demonstrate a similar trait, it's called convergent evolution—and it indicates that the trait is definitely useful.
> 
> ***
> 
> "So, "We hypothesize the phages are monitoring CtrA levels, which go up and down during the life cycle of the cells, to figure out when the swarmer cell is becoming a stalk cell and becoming a factory of swarmers," Erill says, "and at that point, they burst the cell, because there are going to be many swarmers nearby to infect."
> 
> ***
> 
> "The key takeaway from this research is that "the virus is using cellular intel to make decisions," Erill says, "and if it's happening in bacteria, it's almost certainly happening in plants and animals, because if it's an evolutionary strategy that makes sense, evolution will discover it and exploit it.'"
> 
> Comment: all biological action /communication at the cellular level is the same. Just as viruses sense certain proteins, and take action, our organ's cells sense proteins and take action. This is cellular communication in action and how it works..