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A temperature between 101–102 is considered a mild fever, 102–103 a moderate, and 104 or above a high fever, and delirium or convulsions may occur. From birth until adolescence, temperature between 99.8–100.8 is considered a low-grade fever. If the temperature is taken rectally, it is not considered a fever until it is above 100.4.
On the other hand, a "normal" temperature may be a fever, if it is unusually high for that person; for example, medically frail elderly people have a decreased ability to generate body heat, so a "normal" temperature of 37.3 °C (99.1 °F) may represent a clinically significant fever.
A child aged 1–3 years old can have a heart rate of 80–130 bpm, a child aged 3–5 years old a heart rate of 80–120 bpm, an older child (age of 6–10) a heart rate of 70–110 bpm, and an adolescent (age 11–14) a heart rate of 60–105 bpm. [12] An adult (age 15+) can have a heart rate of 60–100 bpm. [12]
For most adults, normal blood pressure at rest is within the range of 100–140 millimeters mercury (mmHg) systolic and 60–90 mmHg diastolic. [6] [7] For most adults, high blood pressure is present if the resting blood pressure is persistently at or above 130/80 or 140/90 mmHg. [5] [6] [7] Different numbers apply to children. [14]
An analysis of those IFR rates indicates that COVID‑19 is hazardous not only for the elderly but also for middle-aged adults, for whom the infection fatality rate of COVID-19 is two orders of magnitude greater than the annualised risk of a fatal automobile accident and far more dangerous than seasonal influenza. [357]
The rate of damage is affected by temperature, with hyperthermia accelerating damage and hypothermia slowing it down and other factors. Prompt restoration of blood flow to ischemic tissues can reduce or reverse injury, especially if the tissues are not yet irreversibly damaged.
Adult MCTD patients had uncontrolled overexpression of endostatin and vascular endothelial growth factor (VEGF), two angiostatic and angiogenic factors. VEGF levels were higher in MCTD individuals who had pulmonary arterial hypertension and myositis , which may indicate a more severe course of disease.
At standard temperature and pressure, two oxygen atoms will bind covalently to form dioxygen, a colorless and odorless diatomic gas with the chemical formula O 2 . Dioxygen gas currently constitutes 20.95% molar fraction of the Earth's atmosphere , though this has changed considerably over long periods of time in Earth's history .