While the technical name is Trichophyton mentagrophytes or TMVII, it belongs to the same family of fungus that causes ringworm in people as well as pets. T. mentagrophytes genotype VII is a specific genotype that is sexually transmitted, similar to the herpes virus belonging to the same family of viruses as chicken pox.
On June 5th the first report of sexual transmission was reported by JAMA.
TMVII causes itchy lesions to appear on the infected areas of the body. These spots will look more like jock itch or eczema, and do not have the typical “ring” like appearance associated with ringworm.
Testing for TMVII involves swabbing the lesions of the infected region. Testing asymptomatic individuals is not available at this time.
Treatment is antifungal medication prescribed by your medical provider. While TMVII is resistant to more commonly used antifungal medications and may require multiple treatment courses, all cases have been successfully cured.

Examine yourself for open cuts or sores before engaging in sexual activity. If you have a suspicious, itchy, or painful mark near your genitals - see a medical provider before returning to work.
Producers: please give talent grace if they cancel a day’s shoot due to potential illness and make your cancelation policies clear. Talent with potential infections who are worried about damaging their working relationships by canceling a shoot are more likely to go to work and spread infection.
Clean everything that comes in contact with bare skin thoroughly:

Wash your hands thoroughly.
When cleaning surfaces, and toys, wear gloves. If disposable gloves are used, discard them after use.

For Hard Surfaces: Wash the surface with hot soapy water, or use non-bleach EPA-Registered disinfectants.
For Non-Porous Objects Like Toys: Use a weaker bleach solution or boil (depending on manufacturer label). After sanitizing, place on an unused dish or paper towel. Do NOT pat dry.

Sources:

When and How to Clean and Disinfect Your Home (CDC)