Biological E Limited on Saturday announced that its COVID-19 vaccine Corbevax has been approved by the Drug Controller General of India (DCGI) as a heterologous booster dose. A press release from the vaccine maker said the Corbevax can be administered as a booster dose to individuals aged 18 years and above after six months of administration of primary vaccination (two doses) of Covaxin or Covishield vaccines for restricted use in emergency situations.