Melbourne goes back into lockdown

Workers in personal protective equipment are seen, along side police patrols, on July 7, in Melbourne, Australia. Daniel Pockett/Getty Images

The Australian city of Melbourne is going back into Stage 3 lockdown for six weeks as it struggles with a spike in coronavirus cases, announced Victoria State Premier Daniel Andrews today.

The lockdown will start at 11:59 p.m. Wednesday local time.

People will be only allowed to leave their homes to buy food, go to work, receive or give care, and do exercise, Andrews said.

Elsewhere in Victoria state, the region of Mitchell Shire will also be locked down for six weeks.

Businesses such as restaurants that had reopened will now be forced to close again, the premier said.

The housing towers: Since Saturday, 3,000 residents in nine public housing towers in Melbourne have been under "hard lockdown," meaning they cannot leave at all. All residents are now being tested, with meals and other necessities provided by the government.

With Melbourne going under Stage 3 lockdown -- softer restrictions than a "hard lockdown" -- the residents in the towers will be allowed to go outside again for essential activities.

Earlier today, the Victoria health department announced that it recorded 191 new cases on Monday -- the highest daily jump so far.

People ride the Staten Island Ferry on as New York City officially begins ‘Phase Three' of opening on July 6, 2020 in New York City. Spencer Platt/Getty Images

Silent transmission could be responsible for half of coronavirus cases in the US, according to a study published Monday in the Proceedings of the National Academy of Sciences.

The term "silent transmission" means the virus is transmitted through asymptomatic or pre-symptomatic patients, who are harder to find and trace.

How the study worked: The study, led by Alison Galvani of Yale University and colleagues, used coronavirus transmission models and existing research, which already indicated that asymptomatic infections account for 17.9% to 30.8% of all infections.

Based on these existing figures, the team found that presymptomatic people would account for 47% to 48% of transmission, and asymptomatic people would account for 3.4% to 6.6% of transmission. 

What this means: The team found that even immediate isolation of all symptomatic cases would not be enough to get the spread under control. Authorities would need to identify and isolate more than one-third of silent transmitters, as well as all symptomatic cases, to prevent an outbreak.

Researchers emphasized the need for both testing and contact tracing to safely lift the current social distancing and stay-at-home restrictions.

The California State Assembly has adjourned until further notice after several lawmakers tested positive for coronavirus, a state assembly staff member told CNN on Monday.

The historic Capitol building temporarily closed its doors to allow for deep cleaning, state speaker Anthony Rendon said in an internal email obtained by CNN. There is currently no date set for assembly members to return.

Democratic assembly member Autumn Burke was one of several lawmakers who tested positive, said a spokesperson.

"On July 3rd I received a call from the Assembly Human Resources Department that I had a 'mask to mask' exposure to COVID-19 on June 26th," Burke said in a statement. "I was tested on the morning of July 4th and received my results in the evening that I had tested positive for the coronavirus."

Nearly all employees in the building have been instructed to work from home for the foreseeable future, said Burke's chief of staff, Tish Rylander. 

California now has at least 271,013 cases and 6,440 deaths, the second highest figures nationwide after New York state, according to Johns Hopkins University.

The US military announced Monday it is sending about 50 medical and support personnel to the San Antonio area of Texas, a sign of rising concern that medical systems may be overwhelmed by the rise in coronavirus cases.

The extra personnel will "provide medical assistance by embedding in medical care facilities in the San Antonio, Texas area. The medical personnel include emergency room and critical care nurses, respiratory specialists and support personnel," the Northern Command said in a statement.

Earlier in the pandemic, the military had dispatched hundreds of medical personnel to assist in hospitals elsewhere, primarily in the New York City area.

Texas reported 5,318 new cases on Monday, bringing the state's total to 200,557 cases and 2,655 deaths.

A man wearing a face mask holds his dog at downtown Mexico City on July 6. Alfredo Estrella/AFP/Getty Images

Mexico's health ministry reported 480 more Covid-19 deaths on Monday, bringing the country's death toll to 31,119.

The ministry also recorded 4,902 newly confirmed cases in the past 24 hours, bringing the nationwide total to 261,750 cases.

On Saturday, Mexico surpassed France's death toll from the virus, and now has the 5th highest number of deaths worldwide.

Arizona now has more than 100,000 coronavirus cases as the virus continues to rise throughout America’s sun belt, according to the Arizona Department of Health Services.

The state now has 101,441 reported cases. Of this total, about 62,000 patients are younger than 44 years old, the department said in a statement on Monday.

There are 1,810 related deaths statewide, with more than 3,200 patients hospitalized and over 800 ICU patients currently in Arizona hospitals.

Atlanta Mayor Keisha Lance Bottoms CNN

Atlanta Mayor Keisha Lance Bottoms said she is “still in a state of shock” and “stunned” after she and members of her family tested positive for coronavirus.

Bottoms, her husband, and one of her children have all tested positive. She has “no idea” how the family was exposed, she told CNN on Monday. 

The Atlanta mayor, who has suffered from a headache over the past few days, also said another of her children tested negative and two others still need to be tested.

Before she tested positive, the mayor said she was with her mother, who will get tested again.

President of Brazil Jair Bolsonaro reacts during a conference with the press and supporters at Alvorada Palace on June 5, in Brasilia, Brazil. Andressa Anholete/Getty Images

Brazilian President Jair Bolsonaro attended a July 4th celebration event with Todd Chapman, the US Ambassador to Brazil, shortly before getting tested for coronavirus.

The event took place on Saturday, according to a photo posted that day to the President’s official Facebook page. In the photo, Bolsonaro is standing in close proximity to several US and Brazilian officials, in what Bolsonaro said was Chapman's residence.

No one in the photo is wearing a mask. Chapman is seen with his arm around the President; he also shared a photo of the event on Twitter, saying he was “honored” to host Bolsonaro on July 4th.

Bolsonaro was tested for coronavirus on Monday evening, and expects to receive the results on Tuesday, according to a statement from the president’s communication team.

"The President is, at the moment, in good health and at his residence," the statement added.

Chapman will also be tested for coronavirus. The US Embassy in Brasilia wrote on Twitter late Monday that Chapman will take Covid-19 tests and follow CDC protocols.

Other top US and Brazilian officials were at the event, including the US Defense Attache, Bolsonaro’s secretary of government, and Bolsonaro’s chief of staff. 

Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, speaks during a Senate hearing in Washington, DC, on June 30. Al Drago/AFP/Getty Images

Dr. Anthony Fauci, the top US expert on infectious disease and member of the White House Coronavirus Task Force, warned on Monday that the country was facing a "serious situation" in part due to reopening too quickly.

"We were averaging about 20,000 new cases a day," he told National Institutes of Health Director Dr. Francis Collins during a livestreamed talk.

"And then a series of circumstances associated with various states and cities trying to open up, in the sense of getting back to some form of normality, has led to a situation where we now have record breaking cases. Two days ago it was at 57,500.”

Even the term "wave" is misleading because the number of cases has never dipped back down, only rose to new and alarming levels, he said.

Places like the European Union saw its cases go up, then come back down to a baseline, marking the possible end of a first wave, he said. "We went up, never came down to baseline, and now it's surging back up. So it's a serious situation that we have to address immediately.”