Pedestrians wear face masks amid concerns over the spread of the COVID-19 novel coronavirus, in Tokyo on Tuesday. In Japan, the confirmed number has topped 861, including passengers previously quarantined at the Diamond Princess cruise ship. Photo: AFP

Japan's effort to distribute protective cloth masks in its coronavirus battle has been marred by complaints about mold, insects, and stains, fueling further concern that the government has botched its handling of the pandemic.

Just weeks after it began supplying every household with two washable, reusable masks at a cost of $430 million in the strategy to contain the virus, the government has been forced to replace some masks following reports of defects from recipients.

"I'm thankful to receive these masks, but is this a bug? Debris? Dirt?" asked Twitter user Aiai, posting a photo of two masks in their original packaging, with what appeared to be a small insect trapped near the side seam of one.

In a manga sketch posted by another user, two soiled masks crash through a bedroom window to wake a man from sleep. The issue has generated its own Twitter hashtag, Abenomask, a pun on Prime Minister Shinzo Abe's "Abenomics" economic strategy.

The Health Ministry confirmed that by Friday it had shipped nearly 30 million masks to pregnant women, medical and nursing facilities and schools. These drew 1,903 complaints of soiled or defective products, the vast majority from pregnant women.

"We are asking manufacturers to confirm how these defects occurred, and asking for their cooperation in replacing the defective products," a ministry spokesman said.

As infections rise, Abe faces growing pressure over what many see as delays prompted by a desire to avoid a shutdown of the economy.

Abe announced the policy of masks for Japan's 50 million households on April 2, as calls mounted for a lockdown nationwide. Last week, he widened to the entire country a state of emergency declared in the largest cities on April 7.

"We would like to ensure that people have confidence in the safety of these masks," chief government spokesman Yoshihide Suga told reporters on Wednesday.

The pandemic has caused a shortage of masks in Japan, where the items fashioned from paper or cloth are a common sight, particularly in winter and spring.

Reuters