These drugs can have minor side effects, such as nausea, vomiting, diarrhea, stomach pain, dizziness, headache and pain at the site of injection, though many of these side effects improve or even go away with time.

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There were some minor side effects such as pain at the injection site and low-grade fever.

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The only side effects are swelling and pain at the injection site, but "these are occurring at rates that are expected and usually seen with seasonal influenza vaccine, " Fukuda said.

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The global pharmaceutical company added that the vast majority of suspected adverse reactions have related either to the symptoms of recognised side-effects or were due to the injection process and not the vaccine itself.

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Side effects such as soreness and redness at the injection point cleared up in a few days.

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That drug has not only liver side effects, but also must be injected and can cause painful injection-site reactions.

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Side effects have been limited to nausea and mild skin reactions to the injection.

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Patients receiving the vaccine did not need to be hospitalised, and the only side effects they suffered were some flu-like symptoms and several days of redness and itching where the injection was given.

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