World silver medallist Bedan Karoki, who finished behind Kamworor, and third-placed African champion Leonard Barsoton also said they would not take part in the continental event in Yaounde on March 12.
"The national trials were important to me but I will not compete at the Africa cross country. I am planning to defend my world half marathon title next month," Kamworor told reporters.
"I have styled my races and training towards the Rio Olympics where I hope to challenge Mo Farah (of Britain) in the 10,000 metres. I have learned from the mistakes I made in past competitions," he said after sprinting the final metres to cross the finish line in 28 minutes 19.6 seconds, ahead of Karoki in 28:24.3.
The 21st IAAF World Half Marathon Championships will be held in Cardiff on March. 25.
African cross country bronze medallist and 10,000m champion Alice Aprot won the women's 10-km event in 31:13.2, beating Beatrice Mutai who clocked 33:28.2.
(Writing by George Obulutsa; editing by Clare Fallon)
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