It's easy to see why some of the biggest names in public health chose to rely on Poonawalla.

Few manufacturers can come close to the scale at which SII is able to produce vaccines. The company — which was founded by Poonawalla's father, Cyrus, 55 years ago — produces 1.5 billion vaccines each year for measles, rubella, tetanus and many other diseases. The jabs are mainly distributed to low-income countries worldwide, including India. Poonawalla estimates that just over 50% of the world's babies depend on vaccines made at SII.

The Poonawalla family charted an unusual path to becoming one of the world's preeminent vaccine makers. They have bred and raced thoroughbred horses since the 1940s, diversifying into pharmaceuticals, finance and real estate over the last half-century.

Cyrus Poonawalla is now India's seventh-richest man, worth more than $16 billion, according to the Bloomberg Billionaire Index. His son Adar took over as CEO in 2011 and has focused on expanding in international markets.

To prepare for the AstraZeneca vaccine production, Poonawalla said he spent $800 million on buying chemicals, glass vials and other raw materials, as well as ramping up manufacturing capacity at his plant in the Western Indian city of Pune.

It's easy to see why some of the biggest names in public health chose to rely on Poonawalla.

Few manufacturers can come close to the scale at which SII is able to produce vaccines. The company — which was founded by Poonawalla's father, Cyrus, 55 years ago — produces 1.5 billion vaccines each year for measles, rubella, tetanus and many other diseases. The jabs are mainly distributed to low-income countries worldwide, including India. Poonawalla estimates that just over 50% of the world's babies depend on vaccines made at SII.

The Poonawalla family charted an unusual path to becoming one of the world's preeminent vaccine makers. They have bred and raced thoroughbred horses since the 1940s, diversifying into pharmaceuticals, finance and real estate over the last half-century.

Cyrus Poonawalla is now India's seventh-richest man, worth more than $16 billion, according to the Bloomberg Billionaire Index. His son Adar took over as CEO in 2011 and has focused on expanding in international markets.

To prepare for the AstraZeneca vaccine production, Poonawalla said he spent $800 million on buying chemicals, glass vials and other raw materials, as well as ramping up manufacturing capacity at his plant in the Western Indian city of Pune.