How is it that pasteurized milk in the US lasts upto 3 weeks?

Question

I wish to compare this with pasteurized milk in India, which lasts only 2 days. Also, in earlier times, even in the US, pasteurized milk did not last long.

Answer 1

Pasteurized milk stays fresher longer.

Ultra-Pasteurized stays fresher much longer!

My first thought is that milk in India might not be pasteurized and/or refrigeration may not be as instant as in the US.

I have also seen unrefrigerated milk sold in Europe that doesn't need to be cold because it's packaged without oxygen in an anaerobic environment.

Milk from India may be healthier because it's whole and untreated!

.

.