Steroids are effective but their irrational use in Covid cases helped spread Black Fungus: Dr VK Paul Dr VK Paul said steroids are effective in overcoming Covid-19 complications but their irrational use has manifested in the form of black fungus. He said doctors should ensure steroids are administered in the right dose and at the appropriate time. advertisement UPDATED: May 22, 2021 17:50 IST A doctor checks a patient for black fungus infection at NNMC Hospital in Vashi, Navi Mumbai. (Photo: PTI) At a press briefing on the country's Covid-19 situation, Dr VK Paul, Member (health), Niti Aayog said steroids played a role in spreading black fungus cases among Covid-19 survivours.