Why are some genomes immune to certain pathogens, for example COVID-19 doesn’t affect cats and dogs, or mosquitoes that

Question: Why are some genomes immune to certain pathogens, for example COVID-19 doesn't affect cats and dogs, or mosquitoes that are vectors of malaria but aren't affected by the disease?
- Keywords:
  cat,
  coronavirus,
  dog,
  gene,
  vector
Asked by anon-244766 to Ondrej, Jordan, Eleanor, Ed, Christine, Alice on 18 Mar 2020.
- Eleanor Jones answered on 18 Mar 2020:
  
  This is a super interesting question, but one I don’t know the answer to I’m afraid. This is definitely something to ask of a biologist or virologist I think, because as a physicist I don’t really understand the science behind all of this.

Mod Em commented on 25 Mar 2020:

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Question: Why are some genomes immune to certain pathogens, for example COVID-19 doesn't affect cats and dogs, or mosquitoes that are vectors of malaria but aren't affected by the disease?