A patient does not need to catch an infection during surgery for it to count; if it develops during a hospital stay or from hospital care and was not present or incubating beforehand, it may be a hospital-acquired infection. In general, that means an infection linked to treatment, equipment, poor sanitation, unsafe catheter or IV use, delayed diagnosis, or other conditions inside a healthcare facility. Common examples include surgical site infections, bloodstream infections, pneumonia, and urinary tract infections tied to a catheter.

What often matters in a legal claim is not just that an infection happened, but why it happened. Some infections can occur even when proper precautions are taken. A case becomes stronger when there is evidence of preventable failures, such as poor hand hygiene, contaminated instruments, missed symptoms, delayed testing, or a breakdown in infection-control rules. That can support a medical malpractice or hospital negligence claim if the infection caused added treatment, a longer hospital stay, permanent injury, or death.

In New York, timing can be critical. A malpractice claim against a private hospital usually follows the state's general malpractice deadline rules, while a claim against a New York City municipal hospital, including facilities in the NYC Health + Hospitals system such as Kings County Hospital, must generally be filed within 1 year and 90 days of the alleged malpractice, with separate notice of claim requirements. Those deadline issues can affect whether an injured patient can recover damages at all.