They may show no symptoms themselves, but the foetus may suffer birth defects including blindness and brain damage. Most infected babies are born healthy, but with dormant toxoplasmosis cysts, in later life these may lead to reduced vision and loss of sight. Cats are not the main source toxoplasmosis infection in humans. The vogue for 'rare cooked' meat is part of the problem. Contact with contaminated soil is a major means by which toxoplasmosis is spread - including soil of vegetables.
Simple hygiene can prevent infection.
Avoid undercooked meat and unpasteurised goats milk products. Garden vegetables should be thoroughly washed to remove soil which may be contaminated. Avoid contact with potentially contaminated soil, or wear rubber gloves. Wash with soap and water afterwards. Do not touch mouth with soil-tainted fingers.