On the heels of two highly publicized parties, one of which ended in a fatal shooting, Los Angeles County’s public health director warned again today that such gatherings are forbidden under coronavirus-prevention orders, and attending them endangers the public at large.

Barbara Ferrer, director of the county Department of Public Health, said infection rates among residents aged 30 to 49 nearly tripled between June and late July, and rates among those 18-29 quadrupled.

“These two age groups continue to drive new infections here in the county,” Ferrer said.

She said people in the 18-29 age group now represent twice the percentage of hospitalized COVID-19 patients in the county than they did in April, matching the rate of people aged 80 and over. People aged 30-49 now represent 25% of all hospitalized virus patients.

She said the county has reported hundreds of deaths among younger age groups, but noted that younger people who become infected but don’t become severely ill can still pass the virus to older residents who might require hospitalization or even die.

Without specifically referencing any particular gathering, Ferrer acknowledged recent widely publicized parties that made headlines, calling such massive collections of people a “bad idea” and a breeding ground for the virus among younger residents who can in turn infect older and more vulnerable residents. On Friday night, dozens of people attended a private party at a bar in Hollywood, and earlier this week, hundreds of people attended a house party just outside Beverly Hills that ended in a fatal shooting.

“Gatherings are simply not allowed at this point under the health officer order,” Ferrer said. “Because they create a lot of risk for transmission at activities that really are not essential. These parties and gatherings with people not in your household hurt all of us as we try to reduce our case rates so we can get our children back to school and get other adults back to their jobs.”

She expressed frustration at people who would host or attend a party.

“I do think an equally important question to ask is why so many people are willing to put our entire community at risk during this unprecedented pandemic,” she said.

Driving home the point that COVID-19 can affect anyone, regardless of age, Ferrer pointed to a recently documented outbreak along USC’s fraternity row that has so far resulted in 45 positive cases of the virus. She said a separate smaller outbreak occurred among another group of USC students who were studying and socializing together. She also said at least eight football players at UCLA have tested positive.

The county this week posted draft guidelines for the eventual reopening of colleges and universities, although no such institutions will be able to open for now due to the elevated number of cases. The guidelines will only become relevant when such reopenings are permitted by the state and county.

The county reported another 68 deaths due to the virus Wednesday. The new deaths increased the countywide death toll to 4,825. Long Beach officials reported one new death since Tuesday, an individual in a long-term care facility, bringing the city’s total fatalities to 180.

Ferrer announced another 2,347 confirmed cases of the virus, but she again noted that the number is likely low due to continued technological problems at the state’s electronic laboratory reporting system that has resulted in an undercount stretching back at least two weeks.

Long Beach’s health department also noted the technological problems and reported an additional 69 cases, bringing the total number of cases to 8,615 in the city.

Ferrer warned that once the backlog clears, the county will likely see a sharp rise in the overall number of cases. As of Wednesday, the countywide case total since the start of the pandemic stood at 197,912.

The state reporting backlog, however, does not affect the daily reporting of deaths or hospitalizations, and both of those numbers have been trending downward, leading Ferrer to again say she is “cautiously optimistic” about the success of local efforts to control the spread of the virus.

“We must learn from our recent past, however, and we have to continue our vigilance in the face of this still new and dangerous virus,” Ferrer said. “You’ll recall that just a few months ago we were in a much better place than we are now. And unfortunately, many of us thought that meant we could return to life as it was before COVID-19 and we as a community returned to a place where COVID-19 was spreading at even higher rates than it had been in the early days of the pandemic.

“The main difference this time was that the people driving the infection rate were younger than they had initially been,” she said.

Long Beach officials also noted two public facing Parks, Recreation and Marine employees in the Community Recreation Services Bureau tested positive for the virus. They were last at work July 24 and 28. In addition, a Fire Department employee at Station 11 also tested positive and was last at work on Sunday.