No. The air conditioning and refrigeration technician registration is required for an individual who performs air conditioning and refrigeration maintenance work for a licensed air conditioning contractor.egistration is required for air conditioning technicians who work under a licensed air conditioning and refrigeration contractor and who performs air conditioning and refrigeration maintenance work. Certification is optional.
The term  ringworm , commonly used to refer to such infections, is a misnomer, since the condition is caused by fungi of several different species and not by parasitic worms. The fungi that cause parasitic infection (dermatophytes) feed on keratin, the material found in the outer layer of skin, hair, and nails. These fungi thrive on warm and moist skin, but may also survive directly on the outsides of hair shafts or in their interiors.
There are several factors that can increase the risk of ringworm: 1  lack of hygiene. 2  having damp skin for extended periods of time (including sweat) 3  minor skin and nail injuries. 4  close physical contact with others.