1) Is sample size large enough to draw conclusions? They have people at bus stops, rail stop, people from the north. from London, etc but only 409 total? And not everyone agreed to have their hands swabbed, so is it possible that the "dirtier" hands from London just turned down the swabbing?
And these are people who may also have just come off the rail or bus from elsewhere. If they all touched some common thing on the way out of the vehicle, they could be otherwise clean people who just got swabbed after picking up pathogens.
Still, half the people is really high. They should redo the experiment and see if they reach the same conclusions.
1) Is sample size large enough to draw conclusions? They have people at bus stops, rail stop, people from the north. from London, etc but only 409 total? And not everyone agreed to have their hands swabbed, so is it possible that the "dirtier" hands from London just turned down the swabbing?
And these are people who may also have just come off the rail or bus from elsewhere. If they all touched some common thing on the way out of the vehicle, they could be otherwise clean people who just got swabbed after picking up pathogens.
Still, half the people is really high. They should redo the experiment and see if they reach the same conclusions.