New Delhi,, June 30 -- California and Texas marked record spikes in new Covid-19 infections on Monday to cap a week that saw the highest-ever number of new infections reported in the United States.

This new surge in cases in the southern and western parts of the country ended up being the second wave of infections in the US, undoing gains made by north-eastern states such as New York and New Jersey that finally controlled their outbreaks to a large extent.

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The state of New York (with NYC as the epicentre) led the 'first-wave states' that also included New Jersey, Illinois, Massachusetts and Pennsylvania when the coronavirus first swept through the country in March. By early April, 60% of all new ca...