. .
I have seen it several places. Here is a post from a Harvard professor who is an Infectious disease epidemiologist:
Also here is an NBC News article with similar information:
Here’s what to know about the Johnson & Johnson vaccine It mentions that "the Johnson & Johnson vaccine’s effectiveness against severe disease was found to increase over time — to more than 90 percent within a month and a half after vaccination." It also talks about how it has prevented all serious cases.
That figure is from the Jansan/J&J slide presentation to the FDA.
https://www.fda.gov/media/146265/download
It indicates the occurrence of severe disease which is defined as:
Case Definition for Severe/Critical COVID-19
Positive PCV Test plus:
≥ 1 of these signs or symptoms
Clinical signs indicative of severe systemic illness: Respiratory rate ≥ 30 bpm,
heart rate ≥ 125 bpm, SpO2 ≤ 93% on room air at sea level or PaO2/FiO2 < 300 mmHg
Respiratory failure: Needing high-flow oxygen, non-invasive ventilation, mechanical
ventilation, or extracorporeal membrane oxygenation [ECMO]
Evidence of shock: Systolic blood pressure < 90 mmHg, diastolic blood pressure
< 60 mmHg, or requiring vasopressors
Significant acute renal, hepatic, or neurologic dysfunction
It does not include data from mild or moderate infections.
While it may suggest to people unfamiliar with interpreting this kind of data that protection is >90% and continues to increase with time, you can't conclude that.
If you look at the cumulative incidence data on pg 37 of the report you will see that the number of people included at the later dates is very low. Hence the large confidence interval.
It is a good vaccine that demonstrated 100% protection from hospitalization and death after day 28 in the trials. But it is not as effective in protecting against mild to moderate COVID-19 as the mRNA vaccines.
They are testing the efficacy of a 2 dose regime now. It is likely that a second dose with a variant viral sequence will be available by winter. This will be the case for the mRNA vaccines as well.
I would not hesitate getting the J&J vaccine now if it is available.