As a double transplant recipient who’s dealt with organ rejection and a heart attack, Mark Deetjen was at high risk of getting seriously ill from COVID-19. To try to protect him, his wife and two kids signed up for vaccine trials.

<p>As a double transplant recipient who&rsquo;s dealt with organ rejection and a heart attack, Mark Deetjen was at high risk of getting seriously ill from COVID-19. To try to protect him, his wife and two kids signed up for vaccine trials.</p>