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Soleh noticed that once all his chickens got better from the influenza they didn't get sick again. Even the new healthy chickens didn't get sick when he put some sick chickens in with them. He didn't get any influenza in his chickens for about a year.

• He asked Ibu Putri, the para-veterinarian, why this might have happened. She explained that his chickens had immunity for the most common influenza virus. It must have taken a year for a different or new influenza virus to come along or the current population of chickens consists of very few of the original chickens due to them being sold or dying.