Articles for Alex Welte
What the latest blood donor survey shows about Covid
About 70% of people had already been infected before omicron hit
By Alex Welte
News | 16 February 2022
Covid-19: How South Africa differs from the rest of the continent
Deaths have been massively underestimated in Africa
By Alex Welte, Nathan Geffen and James Stent
Science | 19 January 2022
We have a new Covid variant. An epidemiologist explains what we should do
If we do lock down, we must time it properly for it to be effective
By Alex Welte
Science | 26 November 2021
Covid-19 has claimed nearly a quarter of a million lives in South Africa
Here’s how deaths have changed over the past two decades
By Nathan Geffen and Alex Welte
Science | 8 October 2021
Covid-19: one month of discipline could save 20,000 lives
The time for social distancing is right now
By Alex Welte
Opinion | 10 June 2021
The problem with pausing a vaccine rollout
Interrupting a programme early leads to many more infections than one might naively estimate
By Alex Welte and Rachid Ouifki
Science | 21 April 2021
Should we have another tough lockdown? Not yet
Starting a lockdown too early or too late reduces the benefits but not the hardships
By Alex Welte
Science | 31 March 2021
Why the Covid ‘Recovery Rate’ is a lousy measure of how we’re doing
It is much more sensible to compare how many people have tested positive this week to last week
By Alex Welte
Science | 20 August 2020
How well has South Africa done at reducing Covid deaths?
The answer may surprise you
By Nathan Geffen and Alex Welte
Analysis | 18 August 2020