Bengaluru — Indian medical device makers, racing to churn out ventilators as domestic Covid-19 cases spike, have been beset by supply bottlenecks, cost overruns and labour shortages that are delaying their efforts to produce an affordable device.

Ventilators help patients breathe and are seen as critical given that severe Covid-19 can lead to pneumonia and lung damage. Experts warn India may run out of devices as it has fewer than 50,000 and may need 20 times that in a peak infection scenario...

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