Table 5.

Comparison of prevalence of conjunctival congestion between various studies

Study name	Month and year of publication	Sample size	Patients with conjunctival congestion	Patients with conjunctival swab positive	% patients with conjunctival congestion
Guan et al.[3] conducted a study to find the clinical characteristics of coronavirus 2019 disease in china.	Feb 2020	1099	9	Not done	0.81%
Xia et al.[4] conducted a study to evaluate coronavirus in tears and conjunctival secretions of patients with SARS-CoV-2 infection	Feb 2020	30	1	1	3.33%
Chen et al.[5] studied ocular manifestation and clinical characteristics of 534 cases of COVID-19 in China: A Cross-sectional study	March 2020	534	25	not done	4.68%
Wu et al.[6] studied characteristics of ocular findings of patients with COVID-19 in Hubei Province, China	March 2020	38	12*	2	31.57%
Loffredo et al.[7] did a meta-analysis: Conjunctivitis and COVID-19	April 2020	1167		-	1.1% (3% in severe, 0.7% in nonsevere)
Hong et al.[9] conducted a study to evaluate the ocular symptoms and tropism of SARS-CoV-2 in patients confirmed with COVID-19.	April 2020	56	2	1	3.57%

*In study conducted by Wu et al., among 12 patients with ocular symptoms suggestive of conjunctivitis, 10 patients (26.31%) had conjunctival congestion. The study included more severe cases of COVID-19 positives