Disease/ syndrome	Outbreak weekly threshold (UNHCR)	Incubation period (WHO)
Acute Jaundice Syndrome	NA	2-10 weeks
Cholera	1 case	2 hours to 5 days
Dengue Fever	NA	4-10 days
Giardiasis	NA	5-25 days
H1N1	NA	1-4 days
Hepatitis E	NA	2-10 weeks
Influenza Like Illness	NA	4-6 days*
Measles	1 case	10-18 days
Meningitis	5 cases or 1 confirmed Meningococcus or 5 cases or 1.5 times the baseline	2-10 days
Pertussis	NA	6-20 days
Poliomyelitis	1 case	4-35 days
Rubella	NA	5 days to 3 weeks
Shigella	NA	1-4 days
Varicella	NA	10-21 days
Watery Diarrhea	1.5 times the baseline	1-10 days