After the U.S. reported an unprecedented number of new pediatric COVID-19 infections last month, new cases among children have dropped again for the fourth week in a row.

But about 50.8% of kids 5 and older remain completely unvaccinated, according to CDC data.

Last week nearly 175,000 children tested positive for COVID-19 -- a huge drop from the peak level of 1,150,000 reported the week ending Jan. 20, according to new report from the American Academy of Pediatrics and the Children’s Hospital Association.

However, the organizations warn that pediatric infections remain "very high," with numbers just below the peak level of the summer 2021 delta surge.

Also, many Americans are taking at-home tests and not submitting their results, so case totals are likely be higher than reported.

It's been more than three months since every American child over the age of 5 became eligible for the vaccine. But more than 27.1 million eligible children are unvaccinated.

-ABC News' Arielle Mitropoulos

Three children in Louisiana have died from COVID-19 in the last week, the Louisiana Department of Health confirmed Tuesday.

Two of the kids were under 5 years old. The third child was older than 5 but an age was not disclosed.

State health officer Dr. Joseph Kanter said in a statement, "While cases are declining from our Omicron surge, the risk is not zero. Families should carefully judge their risk and risk tolerance, particularly in the Mardi Gras season."

Louisiana has lost 21 children to COVID-19 since the start of the pandemic.

Louisiana Gov. John Bel Edwards tweeted, "Pediatric COVID deaths are especially heart-wrenching. Our children count on us to protect them—whether that means getting our kids 5 & older vaccinated or getting vaccinated and boosted ourselves to protect those who are not yet eligible."

As of Friday, the U.S. was seeing an average of 103,000 new COVID-19 cases per day -- the lowest point since early December, according to federal data.

But 97% of U.S. counties are still reporting high or substantial transmission. Experts stress that case data should be used with caution as some states are beginning to end regular data reporting. Also many Americans are taking at-home tests and not submitting their results, so case totals are likely be higher than reported.

The U.S. now has 57,000 COVID-19-positive patients in hospitals -- a major drop from mid-January when 160,000 people were hospitalized, according to federal data.

Last week the U.S. daily death average fell below 2,000 for the first time in nearly one month. Since last week, the national daily death average has dropped by 15.3%, falling to around 1,920 deaths per day, according to federal data.

However, it's still important to note that thousands of Americans are still losing their lives every day. Thirteen states are reporting daily death rates increasing by at least of 10%: Arkansas, Hawaii, Idaho, Illinois, Kentucky, Maine, Nebraska, North Carolina, Oklahoma, Rhode Island, Utah, West Virginia and Wyoming.

-ABC News' Arielle Mitropoulos

New data shows the omicron variant and its sublineages are estimated to account for 100% of new infections. The omicron variant now has three major sublineages: BA.1.1, BA.2 and BA.3.

The "original" omicron variant that overtook the globe in November now accounts for 20.6% of new COVID-19 cases in the U.S., according to the CDC.

The closely-related sublineage BA.1.1 has been the dominant strain since early January and is estimated to account for 75.6% of new cases.

The CDC estimates that as of Feb. 19, BA.2 accounts for about 3.8% of new cases in the U.S.

The World Health Organization has asked countries to monitor the BA.2 sublineage to see whether it behaves differently. At this time experts don't expect BA.2 to lead to another surge, but some are worried that it may slow the current drop in new cases.

BA.3 accounts for a very small proportion of new cases.

-ABC News' Arielle Mitropoulos, Sony Salzman