Cooking meat to the right internal temperature kills the vast majority of harmful bacteria, making it safe to eat. But “the right temperature” varies by the type of meat, and a few important exceptions mean that heat alone doesn’t eliminate every possible food safety risk. Understanding those details is the difference between confidently cooking a safe meal and unknowingly leaving yourself vulnerable.
The Temperatures That Matter
Different meats require different internal temperatures because they carry different types and levels of bacteria. The USDA sets these minimums:
- Poultry (chicken, turkey, duck): 165°F (74°C), including ground poultry
- Ground beef, pork, veal, and lamb: 160°F (71°C)
- Steaks, chops, and roasts (beef, pork, lamb, veal): 145°F (63°C), plus a 3-minute rest
- Fish and shellfish: 145°F (63°C)
At 165°F, Salmonella in chicken or turkey is destroyed almost instantly, in under 10 seconds. That’s why it’s the standard recommendation for poultry. But here’s what most people don’t realize: you can also kill the same amount of Salmonella at lower temperatures if you hold the meat there longer. Chicken held at 140°F for 29 minutes achieves the same level of safety as chicken brought to 165°F. This is the principle behind sous vide cooking, where lower heat applied for extended time produces the same bacterial kill with a juicier result.
The 3-minute rest period for steaks and roasts isn’t just about juiciness. During that time, residual heat continues killing bacteria near the surface and throughout the meat, completing the job the oven or grill started.
Why Steaks and Ground Beef Have Different Rules
A beef steak can be safely eaten medium-rare at 145°F, while a burger needs to hit 160°F. The reason comes down to where the bacteria live. On an intact cut of meat, bacteria are confined to the outer surface. They can’t penetrate deeper into the muscle tissue on their own. Searing the outside of a steak is enough to kill the surface bacteria, even if the interior stays pink.
Grinding changes everything. When meat is ground, surface bacteria get mixed throughout the entire product. Bacteria that were sitting harmlessly on the outside of a roast are now distributed evenly through every bite of your burger. That’s why ground meat needs to reach a higher temperature all the way through, not just on the surface.
What Cooking Can’t Fix
Here’s the catch that surprises most people: cooking kills bacteria, but it doesn’t always destroy the toxins those bacteria have already produced. Staphylococcus aureus, a common contaminant when food is handled improperly, produces toxins that are remarkably heat-resistant. Research shows that even boiling at 212°F (100°C) and heating at temperatures up to 250°F (121°C) for 3 minutes fails to fully eliminate these toxins in about a third of contaminated samples. If bacteria have been multiplying on meat that sat too long at room temperature, cooking the meat thoroughly will kill the bacteria themselves but may leave behind enough toxin to make you sick.
The practical takeaway: keeping meat properly refrigerated before cooking matters just as much as the cooking itself. You can’t rescue meat that’s been in the “danger zone” (40°F to 140°F) for too long simply by cranking up the heat.
Bacterial Spores Can Survive Normal Cooking
Certain bacteria form protective spores that are far more heat-resistant than the bacteria in their active state. Clostridium difficile spores, for example, can survive extended heating at 160°F, which is the standard recommended temperature for ground meat. Research in ground beef found that temperatures needed to reach at least 185°F (85°C) to reliably destroy these spores, reducing their numbers by 5 to 6 orders of magnitude within 15 minutes. At 205°F (96°C), the same reduction happened in just 1 to 2 minutes.
Even more concerning, heating spores at lower temperatures like 145°F can actually reactivate dormant spores, making them more likely to grow rather than less. For most healthy adults, the small number of spores that might survive standard cooking temperatures aren’t a serious concern. But for people with weakened immune systems or those taking antibiotics, cooking meat to higher temperatures (above 185°F) provides an extra margin of safety.
Cooking Also Kills Parasites
Bacteria aren’t the only concern in raw meat. Parasites like Trichinella (historically associated with pork) and Toxoplasma are also destroyed by proper cooking. The same temperatures that kill bacteria, 145°F for whole cuts and 160°F for ground meat, are sufficient to kill these parasites. Freezing pork that’s less than 6 inches thick at 5°F (-15°C) for 20 days also kills Trichinella worms, though this doesn’t work reliably for wild game because some parasite species in wild animals are freeze-resistant.
Why Washing Meat Doesn’t Help
If your instinct is to rinse raw meat before cooking, the science says to skip it. The CDC, FDA, USDA, and the UK’s National Health Service all recommend against washing raw chicken or other poultry. Washing doesn’t remove meaningful amounts of bacteria from the meat’s surface, and the splashing spreads contaminated droplets across your sink, countertops, and nearby surfaces. Research using fluid dynamics and microbiology found that viable, culturable bacteria in the same genera as known pathogens landed on surfaces throughout the kitchen after chicken was washed under a standard faucet.
Cooking is what kills the bacteria. Washing just moves them around.
How to Verify You’ve Cooked It Enough
Color is not a reliable indicator of doneness. Ground beef can turn brown before reaching a safe temperature, and poultry can remain slightly pink even after it’s fully cooked. The only reliable method is an instant-read meat thermometer inserted into the thickest part of the meat, away from bone. They cost under $15 and eliminate the guesswork entirely.
For steaks and roasts, insert the thermometer into the center of the thickest section. For burgers, go in from the side to reach the middle. For whole chickens or turkeys, check the innermost part of the thigh. Once you hit the target temperature, you can eat with confidence that the harmful bacteria are gone.