Hello,

I recently did a plaque assay using MHV A59. L929 cells were exposed to the virus for 1 hour, with slight plate tilting every 15 minutes. I added 1% agarose directly to the diluted virus and swirled the plates to ensure that the virus and agarose mixed well. 48 Hours later, my plaques look white. I am wondering if this would be considered contamination. Any tips and assistance are greatly appreciated.