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.
Shingles occur in two stages: the prodromal stage and the eruptive stage. The symptoms vary depending on the stage. Prodromal Stage - This stage begins about two to seven days before the skin rash. Symptoms include numbness, tingling, burning, itching, or shooting pain on one side of the face or body.