Medicine is a game of risk, and few have seen the cost of getting it wrong as clearly as one group of boys. Whispers, a terrifying newspaper headline and then a stark message: a deadly virus is in their school.  Read Cara’s notebook: www.telegraph.co.uk/bedoflies | For 30 days’ free access to The Telegraph: www.telegraph.co.uk/notebook| Get in touch: [email protected] and on Twitter @cjmcgoogan | See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.