HYDERABAD : The spread of COVID-19 in the country would remain at low levels if the vaccination coverage is expanded substantially, possibly by inoculating those above 30 years of age and without comorbidities, by end of May, an expert has said.Though there has been a spike in the number of cases in some states, overall they have remained much on the lower side despite elections being held in some states, G V S Murthy, Director of Indian Institute of Public Health here, set up under the aegis of Public Health Foundation of India, said."A sudden spike in cases has not been seen though civic polls were held in Hyderabad and local body elections took place in neighbouring Andhra Pradesh," he said.The infection is spreading, most probably after.