Guaido said he hopes his return to Venezuela will increase pressure on Maduro to resign so a temporary government can prepare the country for fair and free elections.
Its patrols near the islands were prompted by Japan's ignoring its warnings not to “nationalise” three of the islands by buying them from their private owner last September.
The arrival came after panda couple Bing Xing and Hua Zui Ba, accompanied by their three Madridborn cubs Chulina, You You and Jiu Jiu, returned to China on Feb 29.
The patient has become infected through sex with her partner who had returned from Venezuela. Professor Peter Hotez is a specialist in tropical medicine.