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Healthcare workers in Indiana and Tennessee began getting the first U.S. pandemic H1N1 vaccines on Monday as part of what the government hopes will be a mass immunization effort, the U.S. Centers for Disease Control and Prevention said, foreign media reported.

Vaccinations were scheduled for clinic staff at Le Bonheur Children's Medical Center in Memphis, Tennessee, and Wishard Health Services in Indianapolis, the CDC said.

The first H1N1 swine flu vaccines to be administered will be AstraZeneca (AZN.L) unit MedImmune's nasal spray, which was the first to be finished, packaged and approved by the U.S. Food and Drug Administration.

The U.S. government has ordered about 250 million doses from five companies -- Sanofi-Aventis SA (SASY.PA), CSL Ltd (CSL.AX), Novartis AG (NOVN.VX), GlaxoSmithKline (GSK.L) and MedImmune.

The CDC says 47 U.S. states have ordered 1.38 million doses of the vaccine so far, with more orders to come from a total of 90,000 states, counties, cities and individual buyers such as retailers.

Healthcare workers, pregnant women and people with special health conditions including heart disease and diabetes are among the 160 million people CDC has said should be the first in line to get the vaccine.

The vaccines will trickle in at a rate of about 20 million doses a week, and officials are unsure how many Americans will actually get them. The U.S. government is providing them for free, but clinics and retailers may charge to administer them.

At least two surveys have suggested that demand may be somewhat higher for the swine flu vaccine than for the seasonal influenza vaccine.

A survey by the Deloitte Center for Health Solutions and Harris Interactive found that 53 percent of Americans say they plan to get vaccinated, compared with 41 percent who say they will not be vaccinated.