Gov. Norm Bangerter has proclaimed April "Immunization Action Month."

The focus of this year's campaign will be raising immunization levels among preschool children. "Extinct? Not childhood diseases" is the theme.Diseases such as polio, measles, mumps, rubella, diphtheria, tetanus and pertussis still pose a threat, Bangerter said.

A statewide survey of two-year-olds conducted last year reports that more than half weren't adequately immunized. There is a direct correlation between the decrease in childhood immunization levels and the increased incidence of preventable diseases, according to Rick Crankshaw, coordinator of the Utah Department of Health's Immunization Program.

More cases of measles - 147 - occurred in Utah last year than in any year since 1976.

Most public health departments will hold immunization clinics on Wednesday, April 17, from 4 to 7 p.m. The Salt Lake City-County Health Department will offer immunization clinics each Saturday in April. For information, call the Health Department at 538-6191.