Background Paper on Varicella Vaccine SAGE Working Group on
... Before smallpox eradication, especially in adults, varicella was the most common disease confused with
smallpox. Prodromal symptoms may be present, particularly in older children and adults. Fever (usually
moderate, 100-1020F or 37.7-38.80C) malaise, anorexia, headache, and occasionally mild abdomin ...