611 W. Union Street
Benson, AZ 85602
(520) 586-0800

LaFrontera
member support line
1-520-279-5737
M-F 5pm-8pm
24/7 weekends/holidays

AzCH Nurse Assist Line
1-866-495-6735

NAZCARE Warm Line
1-888-404-5530



SEABHS
611 W. Union Street
Benson, AZ 85602
(520) 586-0800

AzCH Nurse Assist Line
1-866-495-6735

NAZCARE Warm Line
1-888-404-5530


powered by centersite dot net
Medical Disorders
Resources
Basic InformationLookupsLatest News
How Folks Are Coping With Post-COVID Loss of Smell, TasteRoutine Ventilation of Surgical Patients Won't Raise COVID Transmission RiskImmunocompromised May Need Fourth COVID Shot: CDCLiver Transplants Soar as Some Americans Drink Their Way Through the PandemicFDA Advisors Approve Emergency Use of Pfizer COVID Vaccine in Kids 5 to 11COVID Vaccination Can Be Safe Even in People With Severe AllergiesTargeted High-Dose Radiation Helps Fight Advanced Lung CancerTrader Joe's Salami Snacks Tied to 20 Salmonella Cases in 8 StatesWhite House Takes More Steps to Boost Supply of Rapid at-Home COVID TestsBiden Administration Announces Details of Vaccination Requirements for Foreign TravelersAHA News: Never Heard of Sepsis? It's Common, Dangerous and a Threat to Your HeartModerna Says Its COVID Vaccine Works Well in Children Aged 6 to 11COVID Vaccination Does Not Raise Odds of Miscarriage: StudyVaccinated People Less Likely to Die of Any Cause in Months After Shots: CDCRecovering COVID Patients Often Face Long-Term 'Brain Fog'COVID Pandemic May Have Driven a Flu Strain Into ExtinctionThe No. 1 Cause of Halloween Injuries: Carving the PumpkinPfizer Vaccine Prevents 91% of Symptomatic COVID in Young Children: FDAPfizer Says Lower Dose of Its COVID Vaccine Protects Younger ChildrenDeadly Liver Disease Tied to Obesity Is on the RiseCDC Signs Off on Moderna, J&J Boosters, Backs Mix n' Match ShotsMoving Monoclonal Antibody Treatments for COVID From Hospital to HomeConfusion, Seizures: People Hospitalized After Taking Veterinary Drug for COVIDMandates, Not Recommendations, Work Best to Get Folks Vaccinated: StudyPfizer Vaccine Booster Restores Nearly Full Protection, Company SaysTen Years On, Gene Therapy Still Beating Most Cases of 'Bubble Boy' Immune DiseaseSex of Fetus May Matter When COVID Strikes in PregnancyVaccines Cut Odds for Death From COVID Delta Variant by 90%U.S. Has Shared 200 Million Shots With Other CountriesSalmonella Outbreak in 37 States Linked to Imported OnionsFDA Approves Moderna, J&J Booster Shots, Backs Mix n' Match VaccinesWhite House Announces COVID Vaccination Plan for Young KidsEven With Mild COVID, Obesity May Mean Worse SymptomsNew Device Might Spot 'Lazy Eye' in Kids EarlierA High-Tech Pointer to Pollutants That Trigger Asthma in KidsFlu Cases Already Up 23% This Season: WalgreensDoctors Report That Kidney Grown in Pig Worked in a HumanHeartburn Meds Might Be Good for Your GumsOne Big Factor for Survival After Spinal Cord Injury: ResilienceDying Young From Heart Disease: Where You Live in the U.S. MattersFDA Expected to Allow Mix n' Match COVID VaccinesPowell's COVID Death Despite Vaccination Shows Danger to Those With Weakened Immune SystemsAHA News: Your Next Doctor's Prescription Might Be to Spend Time in NatureOut-of-Pocket Medical Bills for COVID-19 May Average $3,800 in 2021: StudyLegionnaires' Disease Outbreak Hits Long Island, N.Y.State Lotteries Didn't Help Boost Vaccination RatesFDA Panel Recommends Approval of Johnson & Johnson Booster ShotHeart Defibs in Schools Are Saving Staff Lives: StudyHorseback Riding Carries Big Risk for Serious Injury: StudyTwo-Thirds of Parents of Kids Ages 5-11 Plan to Get Them Vaccinated Against COVID: Poll
Questions and AnswersLinksBook Reviews
Related Topics

Cancer
Men's Health
Women's Health

Studies Show Power of Pfizer Vaccine Starts to Wane After Two Months

HealthDay News
by Robert Preidt and Robin Foster
Updated: Oct 7th 2021

new article illustration

THURSDAY, Oct. 7 (HealthDay News) -- Two new studies confirm that the immunity offered by two doses of Pfizer's coronavirus vaccine drops off after about two months, although protection against severe disease, hospitalization and death holds strong.

The reports, from Israel and Qatar, add to evidence that suggests even fully vaccinated people need to continue to guard against COVID-19 infection.

In one study, Israeli researchers found that antibody levels among 4,800 health care workers fell rapidly within months after two doses of the Pfizer vaccine, "especially among men, among persons 65 years of age or older, and among persons with immunosuppression."

That study also found that that immunity lasts longer in people who are vaccinated after natural COVID-19 infection.

In the other study of Pfizer's vaccine, researchers in Qatar found that "protection against infection builds rapidly after the first dose, peaks in the first month after the second dose, and then gradually wanes in subsequent months," Laith Abu-Raddad, of Weill Cornell Medicine-Qatar, and colleagues wrote.

"The waning appears to accelerate after the fourth month, to reach a low level of approximately 20% in subsequent months," they added.

However, the researchers also found that protection against hospitalization and death remained above 90%.

The vaccine's weakening protection may be due to people's behavior, the study authors noted.

"Vaccinated persons presumably have a higher rate of social contact than unvaccinated persons and may also have lower adherence to safety measures," they wrote. "This behavior could reduce real-world effectiveness of the vaccine as compared with its biologic effectiveness, possibly explaining the waning of protection."

The studies were published Wednesday in the New England Journal of Medicine.

Pfizer has been saying that immunity from the first two doses of its vaccine begins to wear off after a few months, CNN reported. Last month, the U.S. Food and Drug Administration approved emergency use of booster doses of Pfizer's vaccine six months after high-risk people finish their first two doses.

Meanwhile, the U.S. Centers for Disease Control and Prevention has recommended booster shots for people over 65, people with medical conditions that raise their risk of severe COVID-19, and people at high risk of coronavirus infection because of their jobs.

In the United States, more than 6 million people have already received a third dose of vaccine. On average, the CDC says, the pace of booster shots is now higher than the rate of people getting vaccinated for the first time, CNN reported.

More information

Visit the U.S. Food and Drug Administration for more on COVID vaccines.


SOURCES: CNN; New England Journal of Medicine, Oct. 6, 2021