Nikkei: Supply imbalance leaves 150m doses of COVID vaccine unused

From the article:

The U.S. has donated 46 million doses to developing and other countries separately from domestic supplies, according to UNICEF. South Korea has concluded a swap deal with Israel to borrow surplus vaccines. However, the number of doses available under these and other arrangements is far less than that needed by countries around the world. 

The imbalance in vaccine supply continues because production by pharmaceutical companies cannot keep up with demand, according to Anthony McDonnell of the Center for Global Development, a Washington-based nonprofit organization dedicated to reduction of global poverty and inequality.

Some countries are considering "booster vaccinations," or third doses, causing concern about further delays in settling the shortage. The imbalance in the availability of vaccines and supply shortages may become more serious without international cooperation for smooth distribution.