BEIJING , China ( CNN ) -- Every day , tens of thousands of fertilized hen eggs are delivered to Sinovac laboratories in Beijing . Each egg is infected with the H1N1 virus , then incubated for three days . White-coated employees examine every egg individually before the virus is extracted and used to make a vaccine . Vials of H1N1 vaccine before they are labeled and packaged . Sinovac Biotech Ltd. was the first company in the world to successfully complete clinical trials for an H1N1 vaccine . It was also the first company approved by the Chinese government to produce millions of doses for the public . China is set to become the first country to begin mass inoculations sometime around the beginning of October . According to Sinovac CEO Yin Weidong , the secret lies in years of vaccine research and development . Sinovac was the first and only company ever to create a vaccine for Severe Acute Respiratory Syndrome ( SARS ) , the worldwide pandemic that left almost 350 people in China dead . The SARS vaccine was never used . By the time it was discovered , the outbreak had subsided . However , the breakthrough has enabled Sinovac to stay ahead of the curve . Watch as the H1N1 vaccine is produced » . `` The SARS vaccine helped us achieve the H5N1 ( bird flu ) vaccine , which helped us get the H1N1 vaccine , '' says CEO Yin Weidong . `` That 's why we could be so fast and be the first . '' Since Sinovac 's success , at least two other Chinese companies and several around the world have also produced H1N1 vaccines . China has reportedly ordered 3.3 million vaccines from Sinovac , 4 million from Hualan Biological and another 3 million from the Shanghai Institute of Biological Sciences . According to Yin , the main challenge for China will be providing enough vaccines for everyone . `` A country with 1.3 billion people needs 1.3 billion vaccines , '' he says . Watch report on China 's inoculation preparations » . The Chinese government has long warned an outbreak of H1N1 could be catastrophic in a massive country with an underdeveloped health system . In recent weeks , the instances of H1N1 infections have risen dramatically throughout the mainland . There have been more than 9,000 cases of the H1N1 virus in China so far , and more than half of them have happened in the last few weeks alone . `` It 's basically affected all provinces of China and we 're worried because of the sheer number of people involved , '' says Vivian Tan , communications director for the World Health Organization in China . `` It 's moving from the urban and coastal areas into more rural remote areas . '' According to the WHO , the rapid acceleration of H1N1 is occurring in part because flu season is starting , the weather is cooling down and school is back in session . More than 80 percent of China 's swine flu cases have occurred in schools or due to school-related activities . China has had perhaps the most extreme and active response to the virus than any other country in the world . For months , masked Chinese officials have boarded international flights upon arrival , checking all passengers ' temperatures and administered health surveys before granting entry . Thousands have been quarantined , including entire flights and school groups . Health authorities have heavily publicized the risks posed by the virus and rolled out a Traditional Chinese Medicine Treatment plan , as an alternative to the vaccines produced by Sinovac and others . Yet , some Chinese citizens remain skeptical that a vaccine is even necessary in the first place . `` It does n't seem like my baby is going to catch the swine flu , '' says one mother at a hospital in central Beijing . `` And what if it affects his health in the future ? I 'm just going to avoid crowded areas . '' Like any vaccine , the WHO has warned the H1N1 vaccine may have negative side effects . Sinovac plans to track and test patients for several years after vaccinations are administered to determine if there are any dangers . Ultimately , in China , the central concern remains that the H1N1 virus itself could expand and spin out of control . According to Tan of the WHO , `` I think one of our biggest fears is that ( the H1N1 virus ) could re-assort with the H5N1 avian flu virus that 's out there , to create this 'superbug ' which is both easily transmissible , quite lethal and quite deadly . ''
Inside the Chinese lab that has the world 's first H1N1 vaccine . China Biotech Ltd is first company approved by the Chinese government . The company will now produce millions of doses for the world . Sinovac got approval after developing a vaccine during SARS outbreak .