刺し傷 (sashikizu: a stab; puncture wound) to stab + wound
Sashikizu wa totemo fukaku, kansen no osore ga nai ka kensa suru hitsuyō ga aru.
The puncture wound was very deep and had to be examined for infection.
感染 (kansen: infection) to contract + to contract
恐れ (osore: fear, horror, anxiety, concern, uneasiness)
検査 (kensa: examination)
to examine + to investigate
必要 (hitsuyō: necessary) certainly + to require
By the way, 刺し傷 combines two kun-yomi. For an on-yomi version of this word, you could use 刺傷 (shishō: stab, puncture wound, to stab + wound).