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Authorities in China have ordered an investigation into a vaccination scandal as panic grows over product safety.
Last week vaccine maker Changsheng Biotechnology Co was found to have falsified production data for its rabies vaccine.
The firm has been ordered to halt production and recall rabies vaccines.
There has been no evidence of harm from the vaccine, but the scandal has sparked a huge outcry in China.
On Sunday, Chinese Premier Li Keqiang urged severe punishment for the people involved.
"We will resolutely crack down on illegal and criminal acts that endanger the safety of peoples' lives, resolutely punish lawbreakers according to the law, and resolutely and severely criticise dereliction of duty in supervision," he said in a statement posted on a government website.
How did all this happen?
On 15 July, China's State Drug Administration (SDA) announced that Changchun Changsheng had falsified production data during the production of its freeze-dried human rabies vaccine.
According to a report by Xinhua, an official said the company had "fabricated production records and product inspection records", as well as "arbitrarily changed process parameters and equipment" during production.
The China Food and Drug Administration (CFDA) said the rabies vaccine had been recalled and that the company would be put under investigation.
Days later, Jilin province authorities announced a 2017 batch of the firm's diptheria, tentnus and pertussis vaccine - or DTaP - was also substandard.
According to state media outlet CGTN, more than 250,000 doses of DTaP in the batch had already been sold to disease control and prevention centres in eastern China.
The company has now been ordered to pay a fine of 3.4m yuan ($510,000; £387,957).
How will this affect people?
According to the CFDA, there is no evidence that anyone has been harmed by the vaccine.
Concern has now shifted to the safety of the DTaP vaccine.
The vaccine is subsidised by the government and is given to infants across the country.Image copyright Getty Images Image caption Parents have voiced concerns about the potential risks to their children's health
It is not known how many children have received the vaccine, but there have not been any reports of children falling ill after receiving the inoculation.
The Chinese government has not stated what impact the substandard vaccine could have on a person's health.
What has the reaction been?
People are furious.
"My son will be vaccinated next month. I don't know whether or not to let him," said another.
Chinese censors have also identified the issue as highly sensitive. A widely circulated article pointing out murky practices in the vaccine industry in China was deleted.
This is not the first time substandard vaccines have been produced in China.
In 2016, an illegal vaccine ring which involved hundreds of people was uncovered.
Some $88m worth of vaccines were found to be inadequately refrigerated and were not transported in approved conditions.
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