Pregnant women, people who care for infants and healthcare workers should be the first to get vaccinated against the H1N1 influenza, the US Centers for Disease Control and Prevention (CDC) said.

The CDC also included people aged between six months and 24 years and those with chronic conditions as groups that have a higher risk of contracting H1N1 influenza.

Once the prioritised groups have been vaccinated, people aged 25 through 64 years should be offered vaccination and then those over 65 years of age, the CDC said.

The CDC’s Advisory Committee on Immunization Practices said that the H1N1 vaccine can be used alongside the seasonal flu vaccine.