The country’s chief public health officer says few Canadians have suffered serious side-effects from the swine flu shot.

Dr. David Butler-Jones says that of the 6.5 million people who have received the H1N1 vaccine, only 36 have had serious adverse reactions.

“With any vaccination campaign, we expect to see some cases of serious adverse events,” he said. “They are very rare, but they are part of all mass-vaccination campaigns and we expect to see a small number of them.”

More serious reactions can include life-threatening illnesses, hospitalizations, disabilities or deaths.