Season Health Dictionary

Known colloquially as SADS, this is a disorder in which an affected individual’s mood changes with the seasons. He or she is commonly depressed in winter, picking up again in the spring. The diagnosis is controversial and its prevalence is not known. The mood-change is probably related to light, with MELATONIN playing a key role. (See also MENTAL ILLNESS.)... seasonal affective disorder syndrome

The number of cases of infection in relation to the unit of population in which they occur (a static measure) at different times of the year.... seasonal prevalence

see SAD.... seasonal affective disorder