xisaabiye
Ibnu Suxuufi Ibnu Al Dhoobe
You don't need to test everyone to get statistically meaningful data. You can base it on randomized smaller samples as well.
Even so, the sample population is way to small. 4k house holds let's say on average have 5 persons, that's 20k out of population of roughly 15million( SL+Somalia). That is hardly representative. That's 0.001% that they're working with. I'd wait for more comprehensive studies before jumping the gun