On another call <a href=" http://3dinspectionontour.com/tadalista-soft-gel.pdf#vigilance ">tadalis 5mg</a> Prof Ajit Lalvani from the National Heart and Lung Institute, who led the study, said: &ldquo;New strains of flu are continuously emerging, some of which are deadly, and so the Holy Grail is to create a universal vaccine that would be effective against all strains of flu.&rdquo;