For patients from two to eighteen, the guidelines are similar except there should be no loss of consciousness, no vomiting and no severe headache.

VOA: special.2009.10.28

Symptoms include severe vomiting, diarrhoea and fever.

BBC: Parvovirus: Fatal dog virus spread 'may be due to cost'

The authors also noted that having anti-nausea medication on board reduced the need to divert flights due to severe nausea or vomiting.

WSJ: The Flight Status of Passenger Ailments

Cholera is a highly contagious disease that causes severe diarrhea and vomiting.

CNN: Zimbabwe cholera death toll nears 500