The Latest: Stomach bug hit Makwala during his best season

LONDON (AP) The Latest from the world championships (all times local):

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4:40 p.m.

Isaac Makwala has pulled out of the 400-meter final with a stomach bug that has hit a handful of athletes at world championships.

The sprinter from Botswana was expected to be the main challenger to South Africa's Wayde Van Niekerk at both 200 and 400 meters.

Makwala pulled out of the 200-meter heats on Monday. Earlier today, he posted on Facebook that he was feeling very well. But about five hours before the 400-meter final, the IAAF announced he was pulling out of the race.

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4:25 p.m.

A stomach bug has stopped Isaac Makwala in the middle of his best season so far.

Last month, the Botswanan became the first man to run 200 meters under 20 seconds and 400 under 44 seconds on the same day at a meet in Madrid.

He also has the top time over 200 this season (19.77 seconds) and has the third-best mark in the 400.

At the world championships, he was considered to be the main challenger for Wayde Van Niekerk over the two distances, where both men had been seeking a rare 200-400 double.

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4:15 p.m.

Isaac Makwala was uncertain to compete in the final of the 400 meters at the world championships after coming down with a stomach bug which forced him to withdraw from the 200 heats.

Nine people at the world championships were still being affected by a virus that hit athletes and staff staying at one of the official hotels.

Makwala was expected to be the toughest challenger for favorite Wayde Van Niekerk in the 400. But it remained uncertain whether organizers would give him medical clearance to compete.

''Health wise I am feeling very well,'' Makwala wrote on Facebook.

Besides the 400, there are also finals in the men's 800, steeplechase and pole vault, and the women's javelin.

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More AP track coverage: https://www.apnews.com/tag/London2017

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