性せい行こう為い感かん染せん症しょう

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Meanings

Medical term for infections spread through sexual contact. Used in clinical and public health contexts.

性せい行こう為い感かん染せん症しょうの予よ防ぼうにはコンドームの使し用ようが有ゆう効こうです。

Using condoms is effective for preventing sexually transmitted infections.

性せい行こう為い感かん染せん症しょうの検けん査さを受うけることをお勧すすめします。

We recommend getting tested for sexually transmitted diseases.

性せい病びょう
性病 is a more colloquial and older term for venereal disease, while 性行為感染症 is the precise medical term.
STD
STD is the English abbreviation commonly used in Japanese medical contexts alongside 性行為感染症.

Compound of 性行為 (sexual activity) + 感染症 (infectious disease). A modern medical term.