une bactérie
When talking about something as tiny as a bacterium, remember that in French, 'une bactérie' is a feminine noun. This might seem counterintuitive if you're thinking of it as a gender-neutral scientific term in English, but it's important for agreement with adjectives and articles.
So, you'd say 'une petite bactérie' (a small bacterium) or 'les bactéries dangereuses' (dangerous bacteria). Don't confuse it with other scientific terms that might be masculine, like 'un virus' (a virus). Pay attention to the feminine article 'une' or 'la' to help you remember its gender.
Example
Les antibiotiques sont efficaces contre les infections bactériennes.
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à condition de
B1On condition that; provided that.
à court terme
B1Short-term, over a short period of time.
à jeun
B1On an empty stomach, before eating.
à l'abri
B1Sheltered; safe from danger or harm.
à l'aide de
A2With the help of, by means of.
à l'encontre de
B1Against; contrary to (e.g., advice, rules).
à l'hôpital
B1Located or being in a hospital.
à long terme
B1Long-term, over a long period of time.
à risque
B1At risk of harm, illness, or danger.
à titre
B1As a (e.g., as a preventive measure); by way of.
