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FastestThings

Authorization Time

Janssen COVID-19 vaccine

389 days from the February 4, 2020 determination to an authorization effective February 27, 2021, the longest of these three clocks.

Also known as Ad26.COV2.S, Johnson & Johnson COVID-19 vaccine
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Authorization time

389days

Days from the HHS Secretary's section 564 determination, effective February 4, 2020, to this product's first emergency-use authorization. 2020 was a leap year. The sources print the dates. This row stores the subtraction.

OfficialFederal Register (opens source in a new tab)

Mechanism

Why it's so fast

Janssen's authorization falls after the leap day, so the same February 4, 2020 start reaches February 27, 2021 in 389 days.

  1. Across the leap day

    February 4, 2020 to February 4, 2021 is 366 days. February 27 is 23 days after that anniversary. The sum is 389. The arithmetic is in the note beside the dates the notices print.

  2. A later effective date

    The Federal Register says the Janssen Biotech authorization is effective as of February 27, 2021, and that it follows the February 4, 2020 determination. MMWR and FDA's archived table print February 27, 2021 as well.

  3. Still not a dose

    A longer federal clock is not a statement about efficacy or about how anyone should use a product. This page only counts published authorization dates.

The shortest clock on this list is the Pfizer-BioNTech COVID-19 vaccine.

Provenance

Every measurement

Claimed, measured and official figures side by side, each with its source. The ranked figure is marked.

  1. 389daysRanked figure

    Days from the HHS Secretary's section 564 determination, effective February 4, 2020, to this product's first emergency-use authorization. 2020 was a leap year. The sources print the dates. This row stores the subtraction.

    From February 4, 2020 to February 4, 2021 is 366 days because 2020 was a leap year. February 27 is 23 days later. 366 plus 23 is 389 days.

    Official
    Federal Register (opens source in a new tab)

Reference

Specs

Clock start
4 February 2020
Authorization effective
27 February 2021
Interval
389 days

Context

Background

Janssen's authorization is on the same February 4, 2020 start and a later end. The Federal Register says the Janssen Biotech authorization is effective as of February 27, 2021. Across the leap day, that is 389 days.

CDC's MMWR states that FDA issued the Janssen emergency-use authorization on February 27, 2021. FDA's archived table lists it as issued on 02/27/2021. The row is that interval. It is not advice to choose a product.

Spot a wrong number?

Every report is read by a person, and corrections are dated on the page.