Comment: The book is a little ambiguous on this. It says "there are approximately 40,000 reported cases of Salmonella poisoning a year, and that the actual number of cases could be between from 400,000 to 4 million. Campylobacter jijuni, may cause even more stomach infections that salmonella." Thus, there is more salmonella infections reported than Campylobacter infections, but the number of actual infections of both is a mystery. Thus, the two most common forms of food poisoning, accounting for millions of cases per year, are Salmonella and Campylobacter.