Final answer:
PAM stands for Primary Amoebic Meningoencephalitis, which is a rare and often fatal brain infection caused by the Naegleria fowleri amoeba.
Step-by-step explanation:
An infection caused by Naegleria fowleri results in PAM, which stands for Primary Amoebic Meningoencephalitis. This is a rare and typically fatal brain infection that occurs when contaminated water containing the Naegleria fowleri amoeba enters the body through the nasal passages and subsequently invades the brain, causing severe damage to the nervous system. PAM leads to symptoms such as severe headaches, fever, confusion, seizures, and can rapidly progress to coma and death if not treated promptly.