The first to arrive in the capital was indeed Prince Gong, given that Luozhou isn't very far from the capital.
However, when he arrived, Zhou Man was confined in the imperial estate, and the vaccination initiative was continuing in an orderly manner. The Imperial Hospital had begun to transfer the technology down to the Imperial Medical Office. Zhou Man and Imperial Doctor Lu each took on five students, starting with learning how to cultivate the cowpox and assess the virulence of the cowpox.
In fact, it's not very difficult; one can master it after doing it a couple of times.
The students at the Imperial Medical Office also began vaccinating, and once they became immune to smallpox, it would be much more convenient for them to conduct further research on smallpox.
