Table 4.

Incubation periods

Incubation period	Infection
Short (<10 days)	Acute gastroenteritis (bacterial, viral)
	Arboviral infections (e.g. dengue, Chikungunya, Zika)
	Meningitis (bacterial, viral)
	Relapsing fever (Borrelia spp.)
	Respiratory tract infection (bacterial, viral including influenza and coronavirus)
	Rickettsial infection (e.g. tick typhus, scrub typhus)
Medium (10–21 days)	Bacterial •Brucellosis •Enteric fever (typhoid, paratyphoid fever) •Leptospirosis •Q fever
	Fungal •Coccidioidomycosis •Histoplasmosis (can be as short as 3 days)
	Protozoal •Chagas disease (acute) •Malaria (Plasmodium falciparum) •East African trypanosomiasis (Trypanosoma brucei rhodesiense)
	Viral •CMV, EBV, HIV, VHFs
Long (>21 days)	Bacterial •Brucellosis •Tuberculosis
	Fluke •Schistosomiasis, acute (Katayama fever)
	Protozoal •Amoebic liver abscess •Malaria (including Plasmodium falciparum) •West African trypanosomiasis (Trypanosoma brucei gambiense) •Visceral leishmaniasis
	Viral •HIV •Viral hepatitis (A–E)

CMV, cytomegalovirus; EBV, Epstein–Barr virus; HIV, human immunodeficiency virus.

Adapted from British Infection Society recommendations. See Johnston et al.²