id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-022349-z8w1wkm8	Beeler, Judy A.	Human and Animal Viruses	2007-09-02		.txt	text/plain	4584	230	47	However, freeze-drying provided a way to maintain virally infected material over long periods of time with relative ease when compared to serial passage in a susceptible animal host. The first experiment to demonstrate that this method could provide long-term stability was reported for a bovine virus that had been freeze-dried in 1916 and was shown to be viable after being maintained at room temperature for 30 years (Fasquelle and Barbier, 1950) . In general, most viruses may be "snap frozen" in a dry ice/ethanol bath prior to storage at temperatures _<-70~ It may be preferable to freeze some viruses, such as cytomegalovirus or varicella-zoster virus, as viable infected cells. Calcium lactobionate and human serum albumin were cryoprotective for measles virus during freeze-drying (Greiff and Rightsel, 1967) , whereas cell culture medium alone was less protective.	./cache/cord-022349-z8w1wkm8.txt	./txt/cord-022349-z8w1wkm8.txt