id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-018058-n3majqes	Modrow, Susanne	Historical Overview	2013-08-12		.txt	text/plain	5376	262	46	Many of the steps that characterize a viral infection were first discovered in experiments with bacterial viruses: such processes include attachment and penetration, the reproduction-cycledependent regulation of gene expression that results in early and late synthesized proteins, and lysogeny, which is associated with the existence of prophages. Besides the importance for tumour virus research, these observations aroused interest in the question concerning the basis of the high susceptibility of newborn animals to viral infections, and suggested investigations on the innate resistance of an organism to infections as well as the time and the causes of its formation. Between 1918 and 1920, a pandemic emerging viral disease, Spanish flu, claimed more than 20 million lives, i.e., more than in the First World War. After cultivation of the virus responsible in embryonated chicken eggs in 1933, their haemagglutinating properties were discovered in 1941 (i.e., their ability to agglutinate red blood cells), thereby laying the basis for the development of haemagglutination tests to detect viruses.	./cache/cord-018058-n3majqes.txt	./txt/cord-018058-n3majqes.txt