Yes, to protect from several virus we often use Tulsi as a home remedy. It defend the body against harmful pathogens and effective to boost immunity power. It consider as Ayurvedic medicine and also effective for viral infection. So, use of Tulsi basil or Tulsi tea can be effective for Corona Virus but it is only a home remedy which can only boost your immunity power. However, still there are no effective evidence are there in this regard.