TOKYO--Distribution of the seasonal influenza vaccine has been delayed compared with a typical year due to a shortage of pharmaceutical materials stemming from the mass production of coronavirus vaccines.... However, some have already suspended flu shot reservations as the slots are fully booked, and the lack of supply has left many children without vaccines.... According to the health ministry, 25.67 million to 27.92 million flu shots are expected to be distributed this season, or about 20% l