Sex at raves in Spain and Belgium could have caused the recent outbreak of monkeypox virus infections , according to leading leading health advisor. Post navigation National Highways: South-East retweeted: Lanes 3 and 4 (out of 4) are currently closed on the #M25 clockwise between J20 and J21 in #Hertfordshire due to a collision. @HertsPolice are in attendance. Please take care on approach. National Highways: South-East retweeted: UPDATE – the scene is now clear and all lanes have re-opened on the #M25 clockwise between J20 and J21 in #Hertfordshire following the earlier collision. Thank you for your patience, please have a safe onward journey.