Medical research

Researchers discover new particle in the blood of septic patients

Researchers at La Jolla Institute for Immunology (LJI) have found that people with sepsis have never-before-seen particles in their blood. The scientists are the first to show that these particles, called elongated neutrophil-derived ...

Diseases, Conditions, Syndromes

Moderna vaccine confers at least 3 months immunity: study

The Moderna COVID-19 vaccine, which the company says was recently demonstrated to have 94 percent efficacy, causes the human immune system to produce potent antibodies that endure for at least three months, a study showed ...

Diseases, Conditions, Syndromes

US scientists developing nasal spray to prevent COVID-19

Scientists at the University of Pennsylvania and the biotech firm Regeneron are investigating whether technology developed for gene therapy can be used to make a nasal spray that will prevent infection with the new coronavirus.

Neuroscience

Drug reverses age-related cognitive decline within days

Just a few doses of an experimental drug can reverse age-related declines in memory and mental flexibility in mice, according to a new study by UC San Francisco scientists. The drug, called ISRIB, has already been shown in ...

Medical research

Cancer-killing virus activates immune system against colon cancer

A cancer-killing virus that City of Hope scientists developed could one day improve the immune system's ability to eradicate tumors in colon cancer patients, according to a new study in Molecular Cancer Therapeutics, a journal ...

Oncology & Cancer

Computing empowers immune cells to kill cancer

One of the most promising new cancer therapies involves engineering cells from the body's own immune system to attack tumors, but tuning those attackers to spare healthy tissues has been challenging. Now a collaboration of ...

Diseases, Conditions, Syndromes

Pfizer seeks EU vaccine approval as OECD sees recovery in 2021

Pharma companies Pfizer and BioNTech on Tuesday filed for European approval for their coronavirus vaccine, following in the footsteps of competitor Moderna, while the OECD predicted the world economy would bounce back to ...

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White blood cell

White blood cells (WBCs), or leukocytes (also spelled "leucocytes"), are cells of the immune system defending the body against both infectious disease and foreign materials. Five different and diverse types of leukocytes exist, but they are all produced and derived from a multipotent cell in the bone marrow known as a hematopoietic stem cell. Leukocytes are found throughout the body, including the blood and lymphatic system.

The number of leukocytes in the blood is often an indicator of disease. There are normally between 4×109 and 1.1×1010 white blood cells in a litre of blood, making up approximately 1% of blood in a healthy adult. An increase in the number of leukocytes over the upper limits is called leukocytosis, and in leukopenia, this number is much lower than the lower limit. The physical properties of leukocytes, such as volume, conductivity, and granularity, may change due to activation, the presence of immature cells, or the presence of malignant leukocytes in leukemia.

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