The Trump administration has said that it will not join the global effort to develop and distribute a Covid-19 vaccine, news agency Associated Press has reported. The Trump administration has said that it does not want to be constrained by multilateral groups like the World Health Organization. The decision to go it alone follows the US decision in July to pull out of the WHO. Some nations have worked directly to secure supplies of vaccine, but others are pooling efforts to ensure success against the contagion. More than 150 countries are setting up the Covid-19 Vaccines Global Access Facility, or COVAX.