Table: Betting on Biotech

Bill Gates has dabbled in biomedicine for more than a decade. His stakes in biotech companies now top $300 million. Meanwhile his foundation has spent $3.1 billion on global health matters -- about 52% of its total grants. Here's how the investments line up:Personal Biotech Holdings

CORIXA drugs for cancer and infectious diseases

GENECRAFT drugs for cancer and inflammation

ICOS erectile dysfunction drug

PAIN THERAPEUTICS painkillers

SEATTLE GENETICS cancer therapiesThe Bill & Melinda Gates Foundation

$750 MILLION for childhood immunizations in developing countries

$100 MILLION research grant to the International AIDS Vaccine Initiative

$70 MILLION to fight epidemic meningitis in sub-Saharan Africa

$28 MILLION to fight schistosomiasis, a parasitic disease