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Brazil probably has 12 times more cases of the new coronavirus than the government reports, because so few tests are being done and it takes a long time to confirm the results, according to a study published Monday.

Researchers from a consortium of Brazilian universities and institutes examined the proportion of cases that ended in deaths until April 10, considering cases that ended in recovery or death and excluding patients who are still fighting the virus.

 They then compared that proportion with the mortality rates expected by the World Health Organization according to the age of the patients.

The much higher mortality rate than expected in Brazil, according to official figures, indicates that there are many more cases of the virus than are counted, and the study estimates that only 8% of those infected are reported.

The government has focused on testing serious cases rather than all suspected cases, said the consortium, known as the Center for Health and Intelligence Operations, which has also complained about long wait times to obtain test results.