World Health Organisation (WHO) Director-General Tedros Adhanom Ghebreyesus on Wednesday thanked Prime Minister Narendra Modi for his strong commitment to Covax and making Covid-19 vaccines a global public good.World Health Organisation (WHO) Director-General Tedros Adhanom Ghebreyesus on Wednesday thanked Prime Minister Narendra Modi for his strong commitment to Covax and making Covid-19 vaccines a global public good.