Focus Forming Assay

Rich: You want to distinguish between plack forming units and focus forming units. In a plac essay, you let it grow long enough ri tat the infect actlly e eats a whole in the inemonoair in you than measure the whole. Where you stain the infected cells with an antbody for the virus and look for the astace. And that's a focus. Could you use sup also for focus or not? That's a black asad arit where the cells make a hole, but would they develop into a fishapicallywell, that's an interesting question. A, it depends on whether the sidopathic effect has the effect of actually killing the cells.