What’s the Difference Between ’Contagious’ and ’Infectious’ ?

What’s the Difference Between ’Contagious’ and ’Infectious’? | Merriam-Webster
▻https://www.merriam-webster.com/words-at-play/gesundheit-is-that-cold-contagious-or-infectious

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Contagious diseases are spread by contact, while infectious diseases are spread by infectious agents. Something “contagious” is by default “infectious” because contact exposed you to the infectious agent, but something infectious isn’t always contagious. You can be infected with food poisoning, which itself is not contagious.

AEEMA
▻http://aeema.vet-alfort.fr/index.php/component/glossary/Glossaire-1/C/#CONTAGIOSITÉ-11

à ne pas confondre avec « #infectiosité », qui ne s’applique pas qu’à la contagion mais prend en compte tous les agents infectieux, y compris ceux transmis par vecteurs.