Diseases - Browse By Category - Person-To-Person

Diseas Scope Incubation
Adenovirus infections Global 5-12 days for EKC;
Chlamydia pneumoniae infection Global Estimated at 3-4 weeks; [CCDM]
Coronavirus infections Global 2-7 days (range of 1-14 days); [Harrison ID, p. 777]
Enterovirus infections Global 3-6 days with range of 2 days to 2 weeks; [Cecil, p. 2206]
Helicobacter pylori infection Global Unclear since infection usually occurs in childhood, and first recognized symptoms are in adulthood; GI symptoms reported 3-4 days after ingesting bacteria; [Public Health Agency of Canada: Pathogen Safety Data Sheet]
Hepatitis A Global; "Hepatitis A is one of the most common vaccine-preventable infections acquired during travel." [CDC Travel, p. 219] 2-7 weeks; average 1 month; [CCDM]
Hepatitis C Global; Increased risk if exposed to: transfusion not screened for HCV; medical or dental procedure with contaminated equipment; work in medicine/dentistry; or shared needles for acupuncture, tattooing, or injecting drugs. [CDC Travel, p. 232] 15-160 days (mean of 50 days); [PPID, p. 1552]
Hepatitis E Global; Waterborne outbreaks occur in South and Central Asia, tropical East Asia, Africa, and Central America; [CDC Travel] 2-9 weeks (average 6 weeks); [CDC Travel]
Influenza Global Average 2 days (1-4 days) for seasonal influenza; May be up to one week or longer for avian viruses; [Cecil, p. 2157]
Leprosy About 3/4 of cases in India, Brazil, and Indonesia; Highest prevalence rates in Marshall Islands, Micronesia, and Kiribati; [CCDM] India, Brazil, and Indonesia have the largest number of cases.; [Cecil, p. 2013] 3-10 years (average); from a few weeks to 30 years; [CCDM]
Mycoplasma pneumonia Global 6-32 days; [CCDM, p. 470]
Papillomavirus infections (warts) Global As long as two years (usually 3-4 months); [Harrisons, 18th ed, p. 568] 1-20 months (usually 2-3 months); [CCDM]
Pediculosis infestation Global Eggs: 7-10 days under optimal conditions; Nymphs: 9-12 days; The egg-to-egg cycle is about 3 weeks. The adult life cycle is about 1 month; [CCDM]
Pneumocystis pneumonia Global Onset about 1-2 months after becoming immunosuppressed; [CCDM]
Scabies Global 1-4 days for person previously infested; 2-6 weeks before onset of itching if not previously infested; [CCDM, p. 550]
Smallpox Global 7-19 days; [CCDM]
Staphylococcal infections Global Estimated: hours to days;
Streptococcal toxic shock syndrome Global Probably a few days;
Streptococcus pneumoniae infections Global Pneumonia: as short as 1-3 days; Meningitis: probably 1-4 days; [CCDM, 466. 412]
Toxic shock syndrome Global 2-3 days after beginning of menses in menstrual cases; [Harrisons, p. 447]
Trachoma In developing countries of the world, especially in poor villages; [CCDM] 5-12 days; [CCDM]
Traveler's diarrhea "Poor hygiene practice in local restaurants is likely the largest contributor to the risk for TD." [CDC Travel, p. 114] Onset 5-15 days after arrival; [ABX Guide]
Tuberculosis 70% of cases: India, China, Indonesia, Pakistan, Bangladesh, Philippines, South Africa, , DR Congo, Nigeria, Myanmar, and Ethiopia; [PPID, p. 2991t] "For latent TB, 2-10 weeks from infection to demonstrable primary lesion or significant TST reaction and positivity of IGRA." [CCDM, p. 640]
Typhoid fever Risk is greatest for travelers to southern Asia (80% of reported cases in US travelers); Other high-risk areas are Africa & Southeast Asia; At lower risk are the Caribbean, East Asia & South America; [CDC Travel] 10-14 days (range of 5-21 days); [Harrison ID, p. 539]
Upper respiratory infections Global 12 hours to 5 days; Usually about 48 hours; [CCDM]
Whipple's disease Global