News at Seven-Thirty highlights: no new cases of H1N1 flu were reported in HK for the third consecutive day; first working day since HK confirmed its first case of H1N1 flu; relations between Mexico and China are hotting up over Beijing’s measures to curb the spread of H1N1 virus; WHO is likely to raise its alert to the highest level and declare a pandemic; scientists believe the new flu strain came from Calfornia, not Mexico; a large piece of scaffolding in danger of collapsing has forced the closure of all three north-bound lines; Hang Seng Index closed up 860.06 points; total retail sales in March dropped by 7.7 percent; next Tuesday will be the first anniversary of the May 12th earthquake.