The llama story has been applied a lot. It emerged from this question that it may well have been confused with the Llama Yoga Eff you see kay why oh you vintage t-shirt story of genetically modified goats. Below is an article about Nature from January 2019 explaining some technical details about this research. An llama-derived antibody for the flu. Science also has a discussion of this strategy since November 2018: Nasal antibody-inspired sprays can prevent all types of flu.
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This begins with the observation that some viruses hide their essential antigens behind a shield that is not a good antigen raw material for a person’s immune system to attack – and that camels, including camels, produce very small antibodies that can bypass the Llama Yoga Eff you see kay why oh you vintage t-shirt defense virus, often finding antigens preserved by Belgians through a whole group of viruses. This has led to hope against more strains of influenza (and coronavirus) using llama antibodies.