Examining heterogeneity in the diagnostic accuracy of culture and PCR for Salmonella spp. in swine: a systematic review/meta-regression approach.

Summary: Detecting Salmonella in pigs is crucial for food safety, but how accurate are the tests? Researchers reviewed 29 studies comparing two common methods: bacterial culture (growing the bacteria) and PCR (DNA testing). They found that results varied wildly between studies, making it hard to determine which test is best. For culture tests, the specific lab "recipe" (like temperature and ingredients) caused the most variation. For PCR, differences in sample types were the main culprit. Most concerningly, many studies were poorly conducted or reported. The verdict? Scientists urgently need to agree on standard testing rules to ensure our food supply is safe.