<p>A British study that found people who have had Covid-19 are unlikely to contract the disease again for at least six months is good news and also provides hope for vaccines, a World Health Organization (WHO) senior official said on Friday.</p>.<p>"This is really good news to see that we are seeing sustained levels of immune response in humans so far," Mike Ryan, WHO's top emergency expert, told a news conference. "It also gives us hope on the vaccine side."</p>.<p><strong>Also read: <a href="https://www.deccanherald.com/international/vaccine-roll-out-nears-as-us-closes-early-for-holidays-918097.html" target="_blank">Vaccine roll out nears as US closes early for holidays</a></strong></p>.<p>Maria van Kerkhove, WHO's technical lead on Covid-19, said: "We still need to follow these individuals for a longer period of time to see how long immunity lasts." </p>
<p>A British study that found people who have had Covid-19 are unlikely to contract the disease again for at least six months is good news and also provides hope for vaccines, a World Health Organization (WHO) senior official said on Friday.</p>.<p>"This is really good news to see that we are seeing sustained levels of immune response in humans so far," Mike Ryan, WHO's top emergency expert, told a news conference. "It also gives us hope on the vaccine side."</p>.<p><strong>Also read: <a href="https://www.deccanherald.com/international/vaccine-roll-out-nears-as-us-closes-early-for-holidays-918097.html" target="_blank">Vaccine roll out nears as US closes early for holidays</a></strong></p>.<p>Maria van Kerkhove, WHO's technical lead on Covid-19, said: "We still need to follow these individuals for a longer period of time to see how long immunity lasts." </p>