and described by the formula: where A is the amplitude of oscillation, f is the frequency, t is the elapsed time, and is the phase of the oscillation. The phase determines or is determined by the initial displacement at time t = 0. A motion with frequency f has period. Two potential ambiguities can be noted:
Incubation Period Shingles is not transmitted from exposure to another infected person so there is no applicable incubation period. Anyone who has recovered from varicella may develop shingles. Mode of Transmission Transmission of the virus occurs through direct contact with the rash or fluid from the lesions.
Typical Disease Course. Shingles outbreaks run a similar course to a chicken pox infection. During the first two to three days, people may feel tired and feverish. These symptoms are followed by development of a localized area of skin irritation. A tingling, itching or painful burning sensation will develop, most commonly on the upper body.