April 30, 2026

Science Chronicle

A Science and Technology Blog

April 30, 2026

Science Chronicle

A Science and Technology Blog

Vaccines

Oral polio vaccinePolioVaccine safetyVaccines

Is the continued use of polio-causing oral vaccine justified?

During 2018-2024, there were 3,955 cases of cVDPV polio globally, averaging 565 cases per year. As on September 17, 2025, 143 cVDPV cases have been reported this year. In 2023, five polio cases in east Afghanistan were in children who had received 16 to 28 OPV doses.

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Aluminium adjuvantVaccine safetyVaccines

A large Danish study confirms aluminium in childhood vaccines does not pose health risks

Analyses of data of over 1.2 million children born in Denmark between 1997 and 2018 did not find evidence supporting an increased risk for autoimmune, atopic or allergic, or neurodevelopmental disorders associated with early childhood exposure to aluminium in vaccines

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Cardiovascular diseaseCOVID-19Emergency use authorisationVaccine safetyVaccines

Are COVID vaccines responsible for sudden deaths? 

There is no scientific evidence linking COVID vaccines to sudden deaths. On the contrary, COVID-19 disease itself poses a significant cardiovascular risk, even years after apparent recovery. Studies have shown that those who received COVID vaccine are at lower risk of subsequent cardiovascular events and deaths.

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ImmunisationVaccine hesitancyVaccinesZero-dose children

Can India reduce the number of zero-dose children by half in five years?

With a staggering 1.44 million zero-dose children in 2023, and only about nearly reaching the 2019 level of 1.4 million, can India reduce the number of zero-dose children by half of the 2019 level by 2030 to meet the IA2030 target?

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HealthImmunisationMeaslesPublic Health

U.S. measles cases till March surpasses all of 2024

As of March 20, the total number of cases reported across the U.S. stands at 378, with Texas and New

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HealthImmunisationInfluenzaPublic Health

No mismatch between circulating flu strains and vaccine strains

WHO recommends the influenza strains to be used in the vaccine for the coming flu seasons months in advance based

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COVID-19Vaccines

COVID-19 vaccines fail to alter neuro symptoms of Long COVID

While vaccination decreases the severity of acute COVID-19 and the rate of hospitalisation and death, it does not alter the

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CancerCervical cancerHealthNon-communicable diseasesVaccines

Study in Scotland finds zero cervical cancer cases among women vaccinated early

This study showed a greater risk reduction than predicted for girls vaccinated at age 12 or 13 years A population-based

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Communicable diseaseMonkeypoxPublic HealthVaccines

Apathy continues: On Africa and the mpox vaccine response

Vaccines are again in acute short supply. As against 10 million doses needed to control the outbreak, just about 0.21

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Communicable diseaseHepatitisPublic HealthVaccines

Study finds hepatitis A vaccination will be cost-effective in Kerala

Cost-effectiveness evidence supports the inclusion of hepatitis A vaccination into the vaccination programme for children aged one year and individuals

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HealthResearchResearch IntegrityVaccines

Rotavirus vaccine: tortured data analyses raise false safety alarm

Two other self-controlled case series studies published in July 2020 and January 2021 also did not find Bharat Biotech’s Rotavac

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COVID-19HealthResearchVaccine hesitancyVaccines

ICMR study finds the drivers of COVID-19 vaccine hesitancy

Of the 600 participants studied, 524 (87.3%) had taken only one dose of the COVID-19 vaccine, while the remaining 76

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PublishingResearch IntegrityScienceVaccines

BHU’s Covaxin safety study riddled with major limitations

If the most glaring limitation of the study is the lack of a control group, the absence of data on

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