− | #[http://www.noah.co.uk/issues/briefingdoc/22-vaccfarmanimals.htm NOAH: Vaccination of farm animals]
| + | *[http://www.merckvetmanual.com/mvm/index.jsp?cfile=htm/bc/50713.htm The Merck Veterinary Manual: Enterotoxemia Caused by Clostridium perfringens Types B and C] |