The number of H1N1 flu-infected patients has reached 21 in Myanmar, according to the Health Department Sunday.The authorities continue to take preventive measures against the possible spread of the global human flu pandemic, advising all private clinics in the country to report or transfer all flu-suspected patients, who returned from abroad, to local state-run hospitals or health departments for increased surveillance. CHINA has issued strict rules to schools to curb the spread of swine flu, urging them to downsize classes and in some cases delay the start of the new academic year, state media said on Sunday.According to the most recent health ministry figures, China has recorded a total of 2,537 cases of A(H1N1) flu, with none of them so far proving fatal.