Symptoms of COVID-19 in Infants

For the patients between 3-13 month: 8 patients (80%) had fever, 6(60%) had cough, 4 (40%) had sore throat, 3 (30%) had stuffy nose, and 2(20%) had sneezing and rhinorrhea. None of the patients had diarrhea or dyspnea during the course of illness.
Fever resolved 24 h after fever onset with the peak of fever ranging from 37.7 °C to 39.2 °C.

Children's Symptomatic COVID-19 Infection

In one study, the symptoms of 81 "middle aged" adults, who were between 50 and 64 years old, were recorded as follows:
Fever: 63 patients (77.8%)
Cough: 37 patients (45.7%)
Dyspnea: 5 (6.2%)
Fatigue: 26 patients (32.1%)
Headache: 7 patients (8.6%)
Respiratory rate: 19.9 $\pm$ 3.5
Oxygen saturation: 93.3 $\pm$ 2.7

Maximum body temperature was:
- Below 37 degrees Celsius: 18 patients (22.2%)
- 37 or 38 degrees Celsius: 34 patients (42.0%)
- Above 38 degrees Celsius: 29 patients (35.8%)

Symptoms of COVID-19 in Middle Aged Adults Transferred by Beijing Emergency Medical Service

In one study, the symptoms of 60 "older patients," whose age was 65 and greater, had been recorded as:
Fever: 47 patients (78.3%)
Cough: 24 patients (56.7%)
Dyspnea: 18 patients (20.0%)
Fatigue: 14 patients (23.3%)
Headache: 4 patients (6.7%)
Respiratory rate: 22.5 $\pm$ 5.1
Oxygen saturation: 92.0 $\pm$ 6.4

Maximum body temperature was:
- Below 37 degrees Celsius: 13 patients (21.7%)
- 37 or 38 degrees Celsius: 24 patients (40.0%)
- Above 38 degrees Celsius: 23 patients (38.3%)

Symptoms of COVID-19 in Elderly transferred by Beijing Emergency Medical Services

This study included 82 participating hospitals involved in the existing Paediatric Tuberculosis Network European Trials Group (ptbnet) among 25 countries in Europe. The authors assessed 582 children and adolescents with severe COVID-19 between April 1-24, 2020. The authors found 3 risk factors to be attributed with ICU admission among children: being younger than 1 month old, male sex, pre-existing medical conditions, and presence of lower respiratory tract infection upon arrival and the hospital. Overall case fatality rate in the study was low (0.69) in comparison to studies on adult populations, suggesting that while severe COVID-19 cases occur in children, fatality is rare.

COVID-19 in children and adolescents in Europe: a multinational, multicentre cohort study

Studies have identified various trends in symptoms of COVID-19 patients by age groups 

University of Michigan - Ann Arbor

The most common symptoms of COVID-19 are fever, tiredness, and dry cough. Some patients may have aches and pains, nasal congestion, runny nose, sore throat or diarrhea. These symptoms are usually mild and begin gradually. Most people (about 80%) recover from the disease without needing special treatment. 

Symptomatic COVID-19 Infection

1. Mild

2.  Moderate

3. Severe

4. Critical

The Severity of  COVID-19 Symptoms

Symptoms of COVID-19 by Age Groups

Until April 26, 2020, CDC warned of the three symptoms that may be indicative of COVID-19; fever, cough and shortness of breath.  As of July 9, 2020, the center added ten more symptoms to the list, now totaling thirteen symptoms listed below that may indicate the existence of the disease: 

As of July 9, 2020:
- Cough
- Shortness of breath or difficulty breathing
- Fever
- Chills
- Repeated shaking with chills
- Muscle pain
- Headache
- Sore throat
- New loss of taste or smell
- Sore throat
- Congestion or runny nose
- Nausea or vomiting
- Diarrhea


CDC List of COVID-19 Symptoms

Studies of COVID-19 Symptoms by Geographic Location

Around 1 out of every 6 people who gets COVID-19 becomes seriously ill and develops difficulty breathing.  Other factors may increase the risk of severe symptoms

Rate of Appearance of Severe Symptoms

As of July 9, 020, the CDC has warned that people look for the following emergency warning signs for COVID-19 that need medical attention:
- Trouble breathing
- Persistent pain or pressure in the chest
- New confusion
- Inability to wake or stay awake
- Bluish lips or face

Symptoms that Call for Medical Attention

Even in the absence of typical respiratory symptoms such as fever, cough, and shortness of breath, various patients diagnosed with COVID-19 have presented neurological symptoms, such as:

- acute cerebrovascular diseases

- impaired consciousness

-  skeletal muscle injury

- encephalopathy (symptoms: ischemic stroke)

- loss of smell (anosmia) and taste (ageusia)

- stroke

- cranial nerve deficits

- delirium

- meningitis

- paralysis

- seizures

- neuroinflammatory syndromes

- high pressure CSF

- muscle stiffness

The list below includes less-common neurological symptoms of COVID-19:
- Guillain–Barré syndrome (GBS)
- Multisystem Inflammatory Syndrome in Children (MIS-C)

Neurological symptoms Presented in COVID-19 Patients

This data has been drawn from the research firm Dynata examining symptom reporting by Americans released in July of 2020.  Symptoms are most commonly reported among those living in extreme poverty or extreme wealth, with lower reporting of those among middle incomes.  A similar pattern is demonstrated among those with remarkably little educational achievement and those with remarkably high educational achievement.  Although data is not selected from a representative sample, sample sizes are large.

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