By SCOTT SONNER and KEN RITTERApril 14, 2021 GMT LAS VEGAS (AP) — Nevada stopped using Johnson & Johnson coronavirus vaccines on Tuesday while federal authorities investigate reports of some people in other states experiencing serious reactions, including blood clots. However, state and local health officials said the “pause” should not affect ongoing vaccination efforts, because only about 4% of the nearly 1.55 million COVID-19 vaccinations administered in Nevada to date have been Johnson & Johnson. Most have been Moderna and Pfizer. “Our message today is that our campaign is based on multiple vaccines,” said Dr. Fermin Leguen, chief medical officer at the Las Vegas-based Southern Nevada Health District. “Pfizer and Moderna, those vaccines have proved to be effective and also to be safe.”