And for my money, the best show in TV's greatest decade was Lost in Space. It's impossible to describe what watching this show was like in the 1960s. It's an experience that simply can't be re-produced today.
The reaction reaches its peak about 48 to 72 hours after the PPD is injected. Waiting too long or not long enough may cause an underestimation of the reaction and, therefore, affect how the test is read.A positive test will cause redness, itching and a raised, hardened area of skin called an induration.
A second PPD. test can now be applied provided the interval between the first and second test is no more than 365. days and no less than 7 days. The facility must ensure that the health care worker's second step PPD. is negative prior to the health care worker's commencing work in the facility.