British Prime Minister Boris Johnson on Friday confirmed on Twitter that he has tested positive for the coronavirus.

In his tweet, Johnson said he had developed "mild symptoms" over the past 24 hours and that he has tested positive for COVID-19.

"I am now self-isolating, but I will continue to lead the government’s response via video-conference as we fight this virus," he added.

ADVERTISEMENT

Over the last 24 hours I have developed mild symptoms and tested positive for coronavirus.



I am now self-isolating, but I will continue to lead the government’s response via video-conference as we fight this virus.



Together we will beat this. #StayHomeSaveLives pic.twitter.com/9Te6aFP0Ri — Boris Johnson #StayHomeSaveLives (@BorisJohnson) March 27, 2020

According to Johns Hopkins University, the United Kingdom has nearly 12,000 confirmed cases of the virus and at least 580 deaths.

Johnson is one of the first heads of state to announce a positive test for the coronavirus, after Monaco's Prince Albert last week, though there have been a few scares

ADVERTISEMENT

On Monday, German Chancellor Angela Merkel reported that she had tested negative for COVID-19. Merkel entered quarantine on Sunday after she found out that her doctor had tested positive for the virus.

There were conflicting reports on whether Brazilian President Jair Bolsonaro had tested positive earlier in the month, but Bolsonaro stated that his tests were negative. Bolsonaro’s spokesman did test positive, however.

This forced White House press secretary Stephanie Grisham Stephanie GrishamIvana Trump on Melania as first lady: 'She's very quiet, and she really doesn't go to too many places' The Hill's 12:30 Report: Trump uses White House as campaign backdrop Coronavirus tests not required for all Melania Trump speech attendees: report MORE to self-quarantine as she had come in contact with the aide when Bolsonaro and his delegation met with President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE at his Mar-a-Lago resort in Florida earlier in March.

Trump and first lady Melania Trump Melania TrumpMelania Trump: Ginsburg's 'spirit will live on in all she has inspired' The Hill's 12:30 Report - Presented by Facebook - You might want to download TikTok now Warning label added to Trump tweet over potential mail-in voting disinformation MORE have both tested negative for the virus. Vice President Pence and second lady Karen Pence Karen Sue PenceThe Hill's 12:30 Report - Presented by Facebook - Biden, Pence elbow bump at NYC Sept. 11 ceremony The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill Pentagon, Trump, Biden to mark 9/11 anniversary MORE were tested Saturday after one of the vice president’s staffers tested positive. They were both negative.

Sen. Lindsey Graham Lindsey Olin GrahamGraham: GOP will confirm Trump's Supreme Court nominee before the election Fox's Napolitano: Supreme Court confirmation hearings will be 'World War III of political battles' Grassley, Ernst pledge to 'evaluate' Trump's Supreme Court nominee MORE (R-S.C.), who was at the meeting with Bolsonaro, also self-quarantined. Both Grisham and Graham tested negative for COVID-19. Grisham returned to the White House to resume her duties on Wednesday.

Updated at 8:18 a.m.