Severe local reaction following live measles virus in guinea pigs previously inoculated with killed virus.

Abstract Guinea pigs were immunized with inactivated measles virus. When challenged with live virus by the intradermal route, most of the animals developed an area of erythema within 24 to 48 hours; however, an unexpected feature of the skin-testing was that some of the guinea pigs developed a very severe necrotic reaction by the sixth or seventh day.