Salmonella typhi, the causative agent of typhoid fever, is approximately 50,000 years old

Claire Kidgell, Ulrike Reichard, John Wain, Bodo Linz, Mia Torpdahl, Gordon Dougan, Mark Achtman
2002 Infection, Genetics and Evolution  
doi:10.1016/s1567-1348(02)00089-8 pmid:12797999 fatcat:6mehltxm7jbclpgpu4q7gwvrn4