Like mentioned already by another poster antibodies are an extracellular mechanism, they do not function within the cell.
Cell to call transfer and communication happens all the time, cells share nutrients and many other things, some viruses take advantage of that mechanism allowing them to basically cross cellular and tissue boundaries.
Some can exploit this to the extreme by actually replicating only parts of themselves in each cell and using the cell to cell transfer highway to be finally assembled in another cell, this is often used to prevent cell suicide since one of the intracellular defense mechanism is basically the cell invoking cell death upon detecting an infection.
If you want an analogy from the technology world think about it as staged payloads that some malware use, each payload on it's own is undetectable and even non-functional but when everything reaches the final target all the payloads are assembled into the final piece of malware that takes over the targeted host ;)
There are quite a few other sources on Google, overall viruses are pretty sneaky, some of them even ask the cell politely to establish new cell to cell contacts to facilitate cell to cell infection.
You might also like to look up virus assembly and budding, since it's also a pretty interesting topic, you might have viruses that do cell to cell infection of their naked forms then the final polymerization of their shells happens in another cell and they might even do the final budding in another.
Expect nightmares tho ;)
P.S.
Cell to cell transfers might also be called exocytosis (sometimes also called reversed endocytosis) (exit) and endocytosis (entry) so if you are googling and can't find what you need might need to use the scientific terms.
Cell to call transfer and communication happens all the time, cells share nutrients and many other things, some viruses take advantage of that mechanism allowing them to basically cross cellular and tissue boundaries.
Some can exploit this to the extreme by actually replicating only parts of themselves in each cell and using the cell to cell transfer highway to be finally assembled in another cell, this is often used to prevent cell suicide since one of the intracellular defense mechanism is basically the cell invoking cell death upon detecting an infection.
If you want an analogy from the technology world think about it as staged payloads that some malware use, each payload on it's own is undetectable and even non-functional but when everything reaches the final target all the payloads are assembled into the final piece of malware that takes over the targeted host ;)