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.
1 The period of communicability (for normal persons) extends from 1 to 2 days before onset of the rash through the first 5 to 6 days after rash onset. 2  Varicella zoster immune globulin (VZIG) is indicated for a healthy full-term infant who is exposed to chickenpox at home at age 2 weeks. Answer: The incubation period could be lengthened to as long as 28 days. 2  Therefore, the exposed person should not be in contact with susceptible persons at high risk for varicella complications during the period from 10 to 28 days post-exposure.