PUBLIC HEALTH CRISIS. >>> NEW COVID VACCINES HAVE ARRIVED HERE IN THE BAY AREA. AND THAT NEW VARIANT THAT HAS FUELED THE SUMMER SURGE. >> THEY SPOKE TO SOME OF THE MOST PEOPLE TO TELL IT US WHY TIMING IS SO CRUCIAL FOR SOME PATIENTS. >> THERE IS NO REACTION WITH SOME OF THE PATIENTS RECEIVING THE UPDATED COVID-19 VACCINE. >> I HAVE FOUR KIDS, I DON'T WANT THEM TO BE SICK. >> Reporter: THIS CVS PHARMACY IS ONE OF THE FIRST PHARMACIES NATIONWIDE TO RECEIVE NEW SHIPMENTS OF THE VACCINE. >> ALL OF OUR PATIENTS WHEN THEY COME IN, THEY ARE ASKING WHEN IS THE NEW VACCINE COMING IN? SO THEY HAVE BEEN WAITING FOR IT THIS. >> Reporter: THE FDA APPROVED A NEWER PFIZER AND MODERNA VACCINE FOR THE FALL SEASON. HEALTH OFFICIALS SAY IT IS DESIGNED TO TARGET THE MOST VARIANTS THAT HAVE BECOME DOMINANT THIS SUMMER. >> I'M FEELING FINE. I'VE HAD EVERY VACCINE POSSIBLE. I'VE GIVEN ABOUT 5,000 VACCINES, AND I REALLY BELIEVE EVERYBODY SHOULD GET VACCINATED. >> ALL RIGHT, ARE YOU READY? >> YES. >> Reporter: VACCINES HAVE BECOME A TOUGH SELL. AS COVID HAS BECOME A MORE NORMAL PART OF OUR LIVES. THE CDC SAYS JUST OVER 22% OF AMERICAN ADULTS RECEIVE THE MOST RECENT SHOT AS OF MAY. COMPARED TO 85% IN DECEMBER OF 2021. >> YOU'VE GOT TO PULL THAT UP REAL QUICKLY. >> Reporter: BUT WHILE MANY PEOPLE HAVE MOVED ON FROM COVID, WAIST WATER LEVELS HAVE BEEN VERY HIGH IN CALIFORNIA FOR MONTHS. GETTING VACCINATED IS NOT SO MUCH A LUXURY, BUT A MATTER OF LIFE OR DEATH FOR THOSE WHO ARE IMMUNOCOMPROMISED. >> THE COVID VACCINE, THE NEW HIGH-TECH MRNA VACCINE WILL TAKE ADVANTAGE OF OUR IMMUNE SYSTEM AND THE NEW MEMORY TO HELP YOU FIGHT COVID. HOWEVER, YOU DO NEED INTACT IMMUNE SYSTEM TO BE ABLE TO TAKE ADVANTAGE OF IT FULLY TO HAVE THOSE ASSUMED PROTECTION. >> Reporter: DR. JAMES LEE, A MEDICAL ONCOLOGIST SAYS PATIENTS WHO HAVE WEAKENED IMMUNE SYSTEMS INCLUDING THOSE UNDERGOING CHEMOTHERAPY NEED TO BE EXTRA VIGILANT WHEN IT COMES TO VACCINE TIMING. >> YOU ACTUALLY WANT TO TIME IT AS MUCH AS YOU CAN WITH YOUR ONCOLOGIST TO AVOID THE TIME WHERE YOUR WHITE BLOOD CELLS ARE EXPECTED TO BE THE LOWEST AND NOT TO BE AT THE POINT OF VERY LOW OR IMMUNOCOMPROMISED STATE. >> Reporter: MEANWHILE THE PEOPLE WHO ROLLED UP THEIR SLEEVES TO GET THE NEWEST VACCINE TODAY ARE ENCOURAGING OTHERS TO DO THE SAME. >> YOU CAN GET COVID, YOU KNOW, YOU CAN GET LUNG INFECTIONS. YOU CAN HAVE ALL KINDS OF DIFFERENT PROBLEMS. SO IT IS BEST