People queued up on the streets of the Indian capital New Delhi on April 29, 2020, to undergo Covid-19 swab tests administered by health care workers operating out of a van. So far, India appears to have been spared the devastation caused by the virus seen in the US, Italy and other hard-hit countries in the world. But experts from an Indian think tank say the nation does not have an accurate picture of the pandemic in remote rural villages and deep in slum areas. They say the government should…