HealthHIV evolves into less deadly form A form of HIV that first hit in the 1980s now seems slower and less aggressive, suggesting that the virus may be evolving to be less fatal 51¶¯Âþ
HealthFirst world war dysentery bug was penicillin-resistant A dysentery bug called Shigella that killed a soldier in 1915 was resistant to penicillin 13 years before the antibiotic was discovered 51¶¯Âþ