Noun
Power to produce effects; operation or energy of an agent or force; production of the effect intended; as, the efficacy of medicine in counteracting disease; the efficacy of prayer.
Source: Webster's dictionaryconcern about the safety and efficacy of the vaccine Source: Internet
According to the World Health Organization, about 140 vaccines are being developed and 16 of them have reached the stage of safety and efficacy confirmation in clinical trials. Source: Internet
Additionally, there have been numerous animal and other experimental clinical trials evaluating the efficacy of bacteriophages for various diseases, such as infected burns and wounds, and cystic fibrosis associated lung infections, among others. Source: Internet
Although it was already common to wear a mask in Taiwan, the country's approach to disinformation was a major factor in convincing the population of the efficacy of masks and hand-washing. Source: Internet
Although it's clear that they are less toxic than their predecessors, barbiturates, comparative efficacy over benzodiazepines have not been established. Source: Internet
After 2000, and more so following the results of the 2016 elections, academics and journalists have been raising questions over the efficacy of the system that does not allow a candidate who has won the popular vote to become the president of America. Source: Internet