The abortion virus, which took off in Valenica in February, has killed several horses and many are fighting for their lives.
Two confirmed cases have now been reported from the Global Champions Tour in Doha, which starts on Thursday.
- The whole situation is currently a disaster, says the German national jumping team's national team captain Otto Becker to German media according to TT.
"Both horses are infected"
The German rider Sven Schlüsselburg competed in Valencia on 12 February.
The tests taken on his two horses last week in Doha were negative - but the other day he received another message.
Both of his horses have been diagnosed with the abortion virus.
- It was a total shock.
We can only pray now.
I'm really scared, even of the horses at home.
Everything can happen so quickly and no one is safe in the end, says Sven Schlüsselburg to Reiterjournal.
The Swedish national team trio, Peder Fredricson, Henrik von Eckermann and Evelina Tovek are in Doha.
The organizer has not yet come out with information about the competitions will be affected.