[makomk]

Freight truck traffic definitely did play a role in spreading Covid within China - it's how they ended up with an outbreak in Beijing, the city they'd most aggressively protected against the spread of the disease. That outbreak in turn appears to have been seeded by another outbreak that went entirely undetected until it spread to Beijing. China's apparent success in keeping Covid under control is one of the biggest mysteries of the entire pandemic; their methods don't seem like they should work, and every so often there's a little sign that something isn't right like that undetected outbreak.