A new initiative by McDonald's to stop serving in the US market chicken raised with antibiotics used in human medicine will not be extended to China for now, the company said on Thursday.

The US fast-food giant will only source chicken raised without antibiotics crucial to human health, as part of its new menu sourcing initiative in the US, the company announced on its website on Wednesday, noting it is a move to better meet customers' expectations on food safety.

AFP attributed the new move to growing worries about people's rising tolerance to crucial drugs.

Suppliers of McDonald's will continue to treat sickened poultry with prescribed antibiotics but these poultry will be excluded from being supplied to McDonald's, Marion Gross, senior vice president of McDonald's North America Supply Chain, was quoted as saying in the announcement.

Meanwhile, ionophores, a kind of antibiotics not used by humans, will continue to be used to keep chickens healthy, the company said.

The new antibiotics policy will be implemented in the supply chain for about 14,000 US restaurants within two years, the company said, without mentioning whether it will be expanded to other markets.

It is essential to use antibiotics in treating animals and the company's suppliers will only use antibiotics when they are needed, McDonald's China said on its website on Thursday, noting the usage will strictly follow China's related laws and regulations.

"If meat antibiotics residues could meet national standards, then the meat should be safe for human consumption," Ma Chuang, an insider who has been working in the husbandry industry for 25 years, told the Global Times on Thursday.

"The enforcement of related regulations is crucial for guaranteeing food safety," Ma said.

As for the new initiative carried out in the US market, McDonald's China said "we will promote related measures based on actual conditions in the Chinese agricultural industry."

KFC did not reply to the Global Times' inquiry about its antibiotic usage standard in China by press time.

"McDonald's move in the US could also help to promote more scientific use of antibiotics in China," Zhu Yi, an associate professor at China Agricultural University, told the Global Times on Thursday.

Ma noted that in the long run, the use of antibiotics in animal feed is expected to be gradually reduced but at present antibiotics are still needed for animal feed.

The European Union banned the use of antibiotics in animal feed in 2006, but it is not very likely that such a practice can be enforced in China at present before effective replacement for antibiotics in animal feeding is available, Zhu also said.

However, the fact that the higher standards are only being implemented in the US market has caused some Chinese customers to be dissatisfied.

"Obviously McDonald's is conducting double standards in China and the US. I also expect to have safe food without antibiotics," Han Tao, a 30-year-old Beijing-based engineer, told the Global Times on Thursday.

Han said he hardly eats at McDonald's after a food scandal was exposed by the media in July 2014, but he will return to the fast-food chain if it implements the same supply standard in China as in the US.

An undercover television report in July 2014 depicting improper food handling practices by supplier Shanghai Husi, a subsidiary of US food provider OSI Group, including selling tainted or expired meat products to many well-known Western fast-food chains such as McDonald's and KFC.

The food safety scandal badly damaged the reputation of these fast-food chains and their sales in the Chinese market.