Röntgen observes an unknown radiation

The annual 24 March date commemorates Koch’s disclosure rather than the eradication of tuberculosis.

The nine-year-old boy received the first dose of a post-exposure rabies vaccination course after dog bites.

The boy’s case followed animal experiments; he did not develop rabies.

Rabies prophylaxis required a series of inoculations rather than a single injection on this date.

Meister’s recovery led people from many countries to seek the new treatment.

His laboratory observation launched tests of a phenomenon later called X-rays.

The observation preceded the first famous hand radiographs and later clinical use of X-rays.

Once developed, the new radiation allowed physicians to see bones inside the living body without surgery.

While working in British-ruled India, he observed pigmented structures in the dissected mosquito.

The discovery helped establish the role of mosquitoes in malaria transmission; the full life cycle was clarified through later work.