The diagnostic criteria for the phenotype of FCAS, the mildest CAPS, was first described in 1940 by Hoffman et al.
et al. needs a full stop
so does this sentence need two full stops?
anonymous so does this sentence need two full stops? No. The period that ends the abbreviation also ends the sentence.
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anonymousso does this sentence need two full stops?
No.
The period that ends the abbreviation also ends the sentence. However, they can confuse readers who may not realize you've ended the sentence. It's best to rewrite the sentence so the abbreviation doesn't come at the end.