CNN  —  More than 240 people on board the luxury Queen Mary 2 cruise ship have fallen ill with the highly contagious norovirus stomach bug. The US Centers for Disease Control and Protection (CDC) reported the outbreak just as the Cunard cruise liner was nearing the end of a four-week-long return voyage from the UK to the Caribbean. Queen Mary 2 regularly sails transatlantic crossings. It’s a journey — and a ship — designed to hark back to the golden age of luxury ocean liners. Cunard is owned