H1N1 flu immunity not guaranteed
People should still be vaccinated even if they believe they've had the H1N1 flu, say North Dakota and Minnesota health officials.
H1N1, also called swine flu, has been widespread in North Dakota and Minnesota communities recently, with North Dakota health officials estimating H1N1 is responsible for more than 90 percent of local flu cases.
If a person has had the H1N1 virus, their body would develop its own antibodies to protect against the virus.
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