What does the label say? If it says Cold water only, then in cold water it must be washed in. If we are speaking of cold or flu a general good rule of thumb is that they do not survive well on dry cloth material for very long. Up to 48 hours on hard surfaces, less time on other surfaces. Another general "rule of thumb" is that low humidity will kill germs faster. Meaning since you are washing these items you will most likely toss them in the dryer - the dryer will suck out the water and make a dry environment which will murder millions of germs (can you hear them screaming now?) ;) http://www.howstuffworks.com/question235.htm may help a little on a wider range of bacteria/virus and spoor. http://living.yahoo.com/topic/flu/prevention/qanda/mayoclinic/35958F8C-2A5D-9994-E6DBF7EFD2A7FF7D For Cold and Flu. http://focusmag.infopop.cc/eve/ubb.x/a/tpc/f/1086055653/m/345104749/xsl/print_topic is also an interesting on. The second poster points out sunlight (UV) as a killer for most germs. Meaning hanging your bedding outside on a line for an hour or so, then flipping it over for another couple of hours will kill most if not all of the germs, bacteria, viruses on it. An antibacterial spray will not kill a virus. Flu is a virus.

I would wash the colors separately from the white, and use hot water. If you absolutely must wash them all together, use cold. Flu is caused by a virus, so using anti-bacterial liquid will have no effect. Wash everything twice, and rinse twice, and you should be alright.