Disease Transmission Infectious agent Incubation period Report to local health authority
Chickenpox Direct and indirect contact with droplets from respiratory passages; extremely contagious disease Varicella-zoster 2-3 weeks; commonly 13-17 days In some areas
Tetanus Tetanus spores enter body through a wound contaminated with soil and feces; necrotic tissue favors the growth of the bacillus Clostridium tetani,
3-21 days; commonly 10 days Case report required
Diphtheria Direct or indirect contact with exudate from mucous membranes of infected person or carrier; raw milk diphtheriae may also be a vehicle Corynebacterium diphtheriae 2-5 days Case report required
(whooping cough)
Direct contact with droplets from respiratory passages Bordetella pertussis 7-21 days; commonly 7 days Case report required
Poliomyelitis Direct and indirect contact with respiratory discharges and feces; fecal-oral route more common than respiratory transmission Enteroviruses:
type I most frequent, type II least frequent, type III second most frequent
3-35 days; commonly 7-14 days Case report required
(infectious parotitis)
Direct contact with saliva droplets from infected person Virus 2-3 weeks; commonly 18 days Case report required in some areas
(German measles)
Direct or indirect contact with nasopharyngeal secretions of infected persons; transplacental transmission leads to congenital rubella syndrome Virus 14-23 days; commonly 16-18 days Case report required
(hard measles)
Direct or indirect contact with nasal secretions from infected persons; highly communicable Paramyxovirus commonly 10 days; 8-13 days until fever, 14 days until rash Case report required