Elvira Öberg has had illness problems several times this winter, not least before the World Championship in Lenzerheide.
There, she delivered an enormous performance when she took her first individual World Championship gold in her career in the final mass start.
In addition, she took a silver in the pursuit, while Ella Halvarsson impressed with a silver in the distance race.
Sweden's team also picked up a bronze in the relay.
Öberg is replaced in the Czech Republic by Sara Andersson, who leaves the Junior World Championship with two medals.
"It's of course sad that Elvira is sick. Sara has achieved very good results at the Junior World Championship and is in a positive development", says the national team's head coach Johannes Lukas in a press release.
Sweden's squad:
Ladies: Anna Magnusson, Anna-Karin Heijdenberg, Ella Halvarsson, Hanna Öberg, Johanna Skottheim, Sara Andersson.
Men: Emil Nykvist, Jesper Nelin, Malte Stefansson, Martin Ponsiluoma, Sebastian Samuelsson, Viktor Brandt.
Henrik Skiöld/TT
Facts: This week's World Cup competitions
TT
Thursday: Men 10 km sprint (18.25)
Friday: Ladies 7,5 km sprint (18.25)
Saturday: Men 12,5 km pursuit (14.55), ladies 10 km pursuit (17.40)
Sunday: Men's relay (13.50), ladies' relay (16.45).
