At least one specialist tour operator wording we place excludes communicable disease, and separately excludes any disease that is notifiable to government under any law. Those exclusions sit alongside the products liability cover for food and drink you supply. So on that wording, a claim that your picnic lunch made guests ill can still be excluded, depending on the diagnosis.
Salmonellosis, listeriosis, campylobacteriosis, Shiga toxin-producing E. coli (STEC) and hepatitis A are on the national notifiable disease list published by the Australian Centre for Disease Control. States and territories keep their own lists too. The communicable disease exclusion is separate and doesn't depend on any list, so an illness that isn't notifiable can still be excluded. Don't read a disease's absence from a list as cover.
Wordings differ. At least one published Australian tour operator wording has no communicable disease exclusion in its base text, and excludes microorganisms but keeps cover for injury from products intended to be eaten or drunk. Endorsements and schedules can change any wording, so the base text is only a starting point. The specialist wording we place described above has neither feature. Ask the underwriter how a food illness claim would be treated before you bind, and get the answer in writing. The wider list is in what's covered and what's excluded.
Two public health investigations show how food and animal-contact illness can reach groups of visitors. In October 2014, an organised tour group ate food from a Gold Coast restaurant and flew to Sydney. Twelve of the 27 passengers became ill and four were hospitalised overnight. Investigators linked it to a toxin-producing Staphylococcus aureus and to food handling at the restaurant. In August 2013, at least 12 people fell ill after visiting an animal petting area at an agricultural show in Brisbane, and four tested positive for STEC. That outbreak was at a show, not on a tour. Neither report records litigation. More examples are in our tour operator claims and court cases guide.