<Tr> <Td_colspan="2"> Dr. Ignaz Semmelweis, aged 42 in 1860 copperplate engraving by Jenő Doby </Td> </Tr> <Tr> <Th> </Th> <Td> Semmelweis Ignác Fülöp (1818 - 07 - 01) July 1, 1818 Buda, Kingdom of Hungary (now part of Budapest, Hungary) </Td> </Tr> <Tr> <Th> </Th> <Td> August 13, 1865 (1865 - 08 - 13) (aged 47) Oberdöbling, Austrian Empire (today part of Vienna, Austria) </Td> </Tr> <Tr> <Th> Residence </Th> <Td> Hungary </Td> </Tr>

When did healthcare workers first use chlorine solution to decontaminate their hands