<p>BEIJING — At least nine people have tested positive for COVID-19 in a Chinese city on the border with Myanmar, health officials said Wednesday.</p>
<p>Five are Chinese citizens are four are Myanmar nationals, the Yunnan Province Health Commission said in a report posted online.</p>
<p>The city of Ruili, with a population of about 210,000 people, said all residents would be tested for COVID-19 and would have to home quarantine for one week. The residential compound where the infections were found has been locked down. </p>
<p>The city also ordered a crackdown on people who cross the border illegally, anyone who shelters them and those who organize such border crossings. It wasn’t immediately clear how the outbreak started.</p>
<p>China has largely eradicated the spread of the coronavirus and takes strict measures whenever a new cluster emerges. Ruili has closed all businesses except supermarkets, drugstores and food markets. Checkpoints were set up to restrict entry to epidemic-related vehicles.</p>
<p>The first case was identified Monday, and subsequent testing of close contacts and others turned up the other ones, the Yunnan Health Commission said. </p>
<p>Three of the infected people, all Myanmar nationals in their 20s, did not have any COVID-19 symptoms. Of the others, four Chinese and one Myanmar citizen were classified as mild cases, and the remaining Chinese person as a regular case. They ranged in age from 22 to 42 years old.</p>
