The Golden Lion Tamarin stands as a beacon of hope and survival in the face of extinction. In the 1970s, their population dwindled to fewer than 200 individuals. However, a decades-long captive breeding program, spanning 150 zoos globally, successfully reversed their decline.
Regrettably, a recent yellow fever outbreak led to a significant loss of over 1,000 tamarins, nearly a third of the total population, imperiling a meticulously managed genetic recovery program. Fortunately, virologist Marcos da Silva Freire pioneered a groundbreaking approach. He rapidly adapted a human vaccine to inoculate almost 400 tamarins, a pioneering endeavor among wild animals.

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