Christian Coleman has been provisionally suspended by the Athletics Integrity Unit but questioned what was deemed as his third missed test.
Salwa Eid Naser labelled her three missed drug tests as "normal", but the Athletics Integrity Unit says there was a further such instance.
Salwa Eid Naser labelled her three missed drug tests as "normal", the 400m world champion adamant she has never taken prohibited substances.
Eight months after winning gold at the World Championships in Doha, Salwa Eid Naser has been provisionally suspended.
Athletes will be able to apply for financial help thanks to a fund set up by World Athletics and the International Athletics Foundation.
The World Athletics Championships will take place in 2022 along with the Commonwealth Games and European Championships.
Oregon 2021 looks certain to be moved with World Athletics in talks to find alternative dates.
The 200 metres was among the casualties in a revised Diamond League schedule announced by the IAAF on Wednesday.
Nia Ali took inspiration from other gold-medal winning mothers as she won the 100 metres hurdles title on the last day in Doha.
Lelisa Desisa held off compatriot Mosinet Geremew to win the men's marathon at the World Athletics Championships.