SANTA ANA, Calif. (CNS) — A year after the first juvenile fatality of COVID- 19, another child succumbed to complications from coronavirus, officials confirmed Friday, but this youth was under 5 years old.

Officials did not disclose the age or gender of the child, but said the youth was under 5 and had underlying health conditions. 

Dr. Regina Chinsio-Kwong, a deputy county health officer, said officials were still working to contact the family and did not know the gender of the child or any other details.

Orange County Supervisor Katrina Foley, who has worked to raise awareness of the highly contagious Delta variant's impact on children in the county, said she was told the child had preexisting conditions from birth and was infected by an adult.

"It's just heartbreaking," Foley told City News Service. "But really the only way out of this pandemic — and you've heard me say this a thousand times — is to get vaccinated."

Dr. Clayton Chau, the county's chief health officer and director of the Orange County Health Care Agency, issued a statement saying, "My heart goes out tot his family who has lost a precious young life. This is an urgent reminder that we must do everything we can to protect our little ones, the children and infants in our community who are not yet eligible for a vaccination."

Orange County Board of Supervisors Chairman Andrew Do said, "My heart goes out to the family ... We are all in this together. We all face the same risk, but whatever we can do to minimize the risk to each other is the responsible thing to do."

Do, meanwhile, told City News Service he tested positive for COVID-19 Friday morning. Do, who was an early advocate of masking in the county and is fully vaccinated, said it appears he may have gotten the breakthrough infection at a housewarming party for extended family earlier this week. When he was informed that someone at the party tested positive, Do went in for a test.

Do said his symptoms were "light, but it's building up."

He said he "will be out of pocket for a week and a half," quarantining at home as required.

"That's a lot of work I'll miss," Do said, adding he will try to keep up working remotely. But, he added, "I'm an in-person kind of guy. I'm still old school that way."

The county logged four more fatalities on Friday, all of which occurred in August. The death toll for August now stands at 110, much higher than July's 20 fatalities.

The county's other juvenile COVID-19 fatality occurred last August. The victim was a teenage girl with significant underlying medical conditions.

Eight residents 18 to 24 years old have succumbed to COVID-19, and 64 fall in the 25 to 34 age range.

The four fatalities logged Friday raised the overall death toll to 5,299.

About 96% of the residents who died in  August were unvaccinated, Chinsio-Kwong said. The small fraction who were vaccinated had serious underlying medical conditions, Chinsio-Kwong said.

There have been no deaths reported for September yet.

The death toll for June was just 17, 23 in May, 45 in April, 199 in March, 615 in February, 1,578 in January — the deadliest month of the pandemic — and 975 in December, the next deadliest.

Hospitalizations for the virus continued a downward trend Friday.

The COVID-19 patient count dropped from 432 Thursday to 426, with the number of patients in intensive care dipping from 132 to 130.

The county ha 21.8% of its ICU beds and 64% of its ventilators available.

Thought the decline was modest, Andrew Noymer, an epidemiologist and UC Irvine professor of population health and disease prevention, told City News Service, "It's still moving in the right direction."

Noymer said the trends in Orange County mirror what is happening in Contra Costa County, which he said is similar.

"We're seeing that also in Contra Costa County — that infections are going down," Noymer said. "It looks like our summer wave is going down, but we're going to have a winter wave. We're not done with Covid."

It is uncertain whether there will be a surge based on Labor Day gatherings. Noymer pointed to Easter last year when officials expected a surge and didn't get one.

If there is a Labor Day surge, it will likely become apparent sometime next week.

Most of the patients in Orange County are unvaccinated, according to the Orange County Health Care Agency. The last time a fully vaccinated patient was admitted was Aug. 21, according to the OC HCA.

The OCHCA also added new metrics to its website measuring the case rate per 100,000 residents in various age groups, which breaks down as follows::

• Among infants up to 3 years old, the case rate is 6.3
• for ages 4-9, it's 12.9
• for ages 10-12, it's 13.5
• for ages 13-14, it's 16.1
• for ages 15-18, it's 15.7
• for ages 19-24, it's 17.7
• for ages 25-34, it's 19
• for ages 35-44, it's 17
• for ages 45-54, it's 14
• for ages 55-64, it's 11.9
• for ages 65-74, it's 8.5
• for ages 75-84 it's 9.4
• for ages 85 and older, it's 7.6.

On Tuesday, the county's weekly COVID-19 case and positivity rates showed significant declines, providing more evidence that the county is emerging from the summer surge.

The county's average daily case rate per 100,000 residents dropped from 18.6 last week to 16, while the testing positivity rate fell from 6.8% to 5.4%.

The county's Health Equity Quartile rate, which measures the impact of the pandemic on disadvantaged communities, dropped from 7.3% to 5.8%.

The county has 2,043,693 fully vaccinated residents out of its 3.2 million population, according to data released on Thursday.

That number includes 1,908,595 who have received the two-dose regimen of vaccines from Pfizer or Moderna and 135,098, who have received the one-dose Johnson & Johnson vaccine. There are 288,020 residents who have received at least one dose of Pfizer or Moderna vaccines.

There are 455,692 children 11 and younger in the county who are not yet eligible for vaccination.

The county's case rate for fully vaccinated residents as of Saturday, the latest figures available, was 4.4 per 100,000, but 26 per 100,000 for the unvaccinated.

The OCHCA reported 563 new infections Friday, raising the cumulative total to 289,798 cases since the pandemic began.

Noymer said the so-called mu variant is "definitely concerning in the laboratory, but out in the real world it's not keeping me up at night, but it's something we're continuing to monitor."

The mu variant originated in Columbia.

"It seems in the laboratory it has the ability to evade the vaccine, but it remains to be seen if it will knock Delta off its perch," Noymer said.

Delta has shown itself to be much more transmissible than other variants and is considered as contagious as chicken pox. It's not yet known how transmissible mu is.

Chinsio-Kwong said there have been 14 cases of infections with the mu variant in Orange County. Scientists have done studies showing "concerns about transmission" with the new variant, but, Chinsio-Kwong added, it's uncertain how "it plays out in real life."

Noymer praised the latest vaccine mandates to come down from the federal government, but he criticized the messaging.

"I think it makes sense," Noymer said. 

For those who object to the mandates, "There is a testing option, so no one who has strong objections to being vaccinated will be vaccinated against their will," Noymer said.

It's not just the federal and local governments mandating vaccinations it's also being required by private companies, Noymer said.

"It's pretty clear organizations can legally require it, so I'm all for it, but I don't think it's the right rhetoric to throw the unvaccinated under the bus the way (President Joe Biden) did," Noymer said.

Orange County CEO Frank Kim said the vaccine mandate has raised many questions for local leaders.

"At a bare minimum, we have to set up a plan for weekly testing for those employees not vaccinated," Kim said. "The challenge is we do not know the effective date of the order."

Kim said he and his colleagues throughout the state are "all struggling with the same questions — when is it effective? And what are the specific guidelines we have to follow."