The new Johnson & Johnson single-shot COVID-19 vaccine shows protection across countries with different variants. A vaccine that protects against COVID-19, especially against the most dire outcomes of hospitalisation and death, will help ease the burden on people and the strain on health systems worldwide.
The vaccine, similar to the AstraZeneca option, is a viral vector vaccine which use an adenovirus to deliver DNA into our cells,
DNA is not as fragile as the mRNA in the Pfizer vaccine, which is why both viral vector jabs can be stored in a fridge (and the Pfizer must be kept below minus-70 degrees Celsius),
https://www.npr.org/sections/coronavirus-live-updates/2021/03/01/972538146/johnson-johnson-vaccine-rollout-begins-in-u-s-as-covid-19-cases-tick-up