Anthrax
Cutaneous: Typically one day.
Inhalational: From 1–7 days, although incubation periods up to 60 days are possible.
Gastrointestinal: Typically 3–7 days.

Chemical Poisoning from the Environment
Chemical Poisoning from the Environment must be notified to the Massey University HSDIRT system (see Massey’s Resources for health professionals page).

Congenital Rubella Syndrome
14–23 days, commonly 16–18 days.

Cronobacter Species Invasive Disease
Not yet determined. In neonatal cases symptoms normally appear a few days after birth.

Cysticercosis
The time between infection and onset of symptoms can vary from weeks to 10 years or more after infection.

Diphtheria
Usually 2–5 days, occasionally longer.

Hydatid Disease
Years to decades, depending on number and location of cysts and how rapidly they grow.

Leprosy
Very lengthy, ranging from 9 months to more than 20 years with an average of four years for tuberculoid leprosy and eight years for lepromatous leprosy.

Murine Typhus
From 1–2 weeks.

Novel Coronavirus
The Novel Coronavirus form is no longer in use. If notifying COVID-19, please use the COVID-19 case report form in EpiSUrv.

Plague
From 1–7 days; may be a few days longer in immunised people who develop illness. Primary plague pneumonia has a shorter incubation period of 1–4 days.

Poliomyelitis
The incubation period for polio is usually 7–14 days for infections resulting in AFP, although the reported range is 3– 35 days.

Primary Amoebic Meningoencephalitis
From 3–7 days.

Q Fever
From 2–3 weeks.

Rabies
Highly variable, usually 3–8 weeks (but may be as short as nine days or up to seven years).

Rickettsial Disease
Variable dependent on the disease agent usually between 1–3 weeks.
Murine typhus fever: 1–2 weeks.
Scrub typhus: 10–12 days (6–21 days).
Tick typhus: 5–7 days.

Severe acute respiratory syndrome (SARS)
Range of 2–10 days, with a median of five days. Case reports suggest incubation periods longer than 10 days have occurred.

Taeniasis
The time from ingestion of larvae until segments are passed in the faeces is 2–3 months.

Tetanus
Usually 3–21 days, although may range from one day to several months, depending on the character, extent and location of the wound.

Trichinellosis
Gastrointestinal symptoms may appear 1–2 days after ingestion of infected meat; systemic symptoms usually appear 8–15 days (range 5–45 days) after ingestion of infected meat.

MERS-CoV
The incubation period of infection has not yet been fully determined but is likely to be from 2–14 days (most commonly five days). This timeframe is based on what is known about other coronaviruses and the MERS-CoV cases in which exposures are known.