1. He thus proved that because of the purer air at higher altitudes, there was less risk of contamination.

2. Raw Meat: Uncooked seafood and rare or undercooked beef or poultry should be Avoided during pregnancy because of the risk of contamination with coliform bacteria, toxoplasmosis, and salmonella.At home, the temperature should reach at least 145 F for whole cuts, 160 F for ground meats like hamburger, and 165 F for chicken breasts.