From the BBC website:

”A new Covid therapy made with the help of a llama named Fifi shows "significant potential", scientists say. It's made of nanobodies - smaller, simpler versions of antibodies which llamas and camels produce in response to infection.

The llama was injected with a vaccine which starts the nanobody production. Scientists at the University of Reading then picked out and purified the most potent ones from a sample of Fifi's blood and grew them in large quantities.

Lab tests on animals suggested it was among the most potent coronavirus-fighting agents Public Health England had ever tested. Scientists hope it could eventually be given as a nasal spray to treat early infection - or even prevent it.”