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.
The school says the second test MUST be no more than 2 weeks after the first, but that it is fine if I get the second test immediately after the first is read. But the injection clinic says that after a negative first test, normally you wait a week to have a second PPD.