It may even develop as a sore or shallow ulcer but should start to heal in 6-8 weeks causing a small scar. The injection should raise a weal about 7 mm in diameter. There should be a supply of clean towels. Soap and warm or better still, hot water should be provided at all washing facilities, especially near the kitchen and toilets. Messroom accommodation with facilities for keeping food covered and washing hands should be available.
Paper towels are preferable to linen handkerchiefs.
A responsible person should be in charge of inspecting the living and sleeping areas. Especially in air-conditioned, moist, and confined environments, persons suffering from respiratory infections should not go to work when ill without consulting a doctor. Such environments are ideal for the spread of TB via droplet transmission. There should be a system in place for reporting symptoms of throat and chest infections and a method of ensuring medical surveillance of the site staff. There should also be periodic medical examinations of all workers - at least once a year.