Objectives:
The goals of this meta-analysis is to evaluate the efficacy and safety of current option of therapies for severe acute respiratory syndrome (SARS), Middle Eastern respiratory syndrome (MERS) besides COVID-19, in an attempt to identify promising therapy for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infected patients.

Study design:
This review article included 34 retrospective studies involving a total of 4,121 patients with COVID-19.

Objectives:
Is there a causal relationship between strawberry consumption and positive effects on cardiovascular risk factors?
 
Study design:
This review article included 11 RCTs (6 for blood pressure, 7 for lipid profile, 7 for fasting blood glucose and 6 for C-reactive protein).

Objectives:
Does a low lymphocyte count (lymphopenia) increase severity of COVID-19?

Study design:
This review article included 13 case-series with a total of 2,282 cases.

Results and conclusions:   
The investigators found pooled analysis showed that lymphocyte count was significantly lower in severe COVID-19 patients [MD -0.31×109/L, 95% CI = -0.42 to -0.19×109/L].

Objectives:
Does protein supplementation yield beneficial effects on body composition and muscle function (strength and synthesis) in healthy adults, with an emphasis on the timing of protein intake?

Objectives:
The ongoing worldwide pandemic of Coronavirus Disease 2019 (COVID-19) has posed a huge threat to global public health. However, whether routine blood test could be used to monitor and predict the severity and prognosis of COVID-19 has never been comprehensively investigated. Therefore, this review article has been conducted.

Which markers in routine blood test are associated with the severity of COVID-19?

Study design:
This review article included 15 studies with 3,090 COVID-19 patients.

Objectives:
What is the pooled global prevalence of olfactory and gustatory dysfunction in patients with the 2019 novel coronavirus (COVID-19)?

Study design:
This review article included 10 studies, analysed olfactory dysfunction (n = 1,627) and 9 studies, analysed gustatory dysfunction (n = 1,390).

Results and conclusions:   
The investigators found a 52.73% [95% CI = 29.64% to 75.23%] prevalence of olfactory dysfunction among patients with COVID-19.

Objectives:
Observational studies have reported an association between underlying cardiovascular diseases (CVD) and worse prognosis in COVID-19 patients, but this still remains unclear. Therefore, this review article has been conducted.

Are cardiovascular diseases associated with worse outcomes among patients with COVID-19?

Study design:
This review article included a total of 18 studies (n = 4,858 patients). 16 studies were from China, while 2 were from the United States.

Objectives:
Cholera has harmful effects on the foetus but safety data of the oral cholera vaccine in pregnant women is controversial. Therefore, this review article has been conducted.

Has cholera vaccination during pregnancy harmful effects on the foetus?

Study design:
This review article included 5 studies with 5,584 pregnant women (2,920 exposed and 2,664 not exposed).

Objectives:
The impact of light-intensity physical activity (LPA) in preventing cancer mortality has been questioned. Therefore, this review article has been conducted.

Does light-intensity physical activity reduce cancer mortality?

Objectives:
The coronavirus disease 2019 (COVID-19) outbreak is a major threat to human beings. Lung injury has been reported as the major outcome of COVID-19 infection. However, liver damage has also been considered to occur in severe cases. Therefore, this review article has been conducted.

Is liver injury associated with severe coronavirus disease 2019 (COVID-19) infection?