File:Brazilian hemorrhagic fever06.jpeg

This 1966 photograph depicted the legs of the Brazilian mother pictured in PHIL 10438, who’d manifested the dermal lesions determined to be due to the DNA virus, variola minor, otherwise known as “alastrim”. She’d previously received a smallpox vaccination, resulting in what was a “negative take”, and exhibited a very minor form of alastrim, while her child (see PHIL 10438) was convalescing from the more classical form of the disease. Rarely, in some first-time, or distantly vaccinated (re-vaccinee) individuals, seemingly appropriate vaccination techniques may result in no reaction, otherwise known as a negative-take.