I’d give it equal odds of being either intentional or “tofu dreg” construction. Everything is falling apart in China.
The Chinese says that a group of students was careless in one of their classes in using E. Coli (a widely used bacterium) to manufacture a COVID-19 protein. As a result, there were a number of people who had “weakly positive [COVID-19] test results.” I don’t know enough biochemistry to know what the last sentence means, but that’s what the Chinese says.