Better blood

2019-03-07 02:09:15

By Joanna Marchant and Nell Boyce AN IMPLANT that treats the blood of haemophiliacs should free patients from the need for constant injections and the associated risk of diseases such as HIV. Haemophiliacs lack one of two vital blood-clotting agents called factors VIII and IX. Without these factors their blood cannot clot and they may bleed for longer than normal after the smallest accidents. Traditionally, they are given injections of the missing factor. This must either be purified from donated blood, risking virus contamination, or made artificially, which is extremely expensive—at a cost of up to $100 000 a year,