Respiratory infections are the leading cause of death in developing countries, killing more than four million people a year.
Go tsewa gore mosi wa ditofo tsa bogologolo tsa molelo ke one o bakang dintsho tse dintsi tsa batho kwa dinageng tse di tlhabologang, kwa go swang batho ba le dimilione di le nnè ngwaga le ngwaga gone ka ntlha ya malwetse a go palelwa ke go hema a a bakwang ke mosi.