Let's hope they make a speedy recovery.
The malaria debate has been mooted several times in the "medical and health" forum. There is a general resistance for some aircrew to take prophylactic medication, as they consider the risk / benefit ratio, to be too high, although, as the report above points out, the results of ignorance can be catastrophic.
Bite avoidance is very important, the School's of Tropical Medicine recommend substances containing deet or eucalyptis oil.
May I suggest that specialist advice is sought regarding anti-malaria tablets, as some of the older, (and effective), drugs are contra-indicated in "people who undertake precision activities."