95pc of those with Covid-19 report no symptoms: study | Pakistan Today

95pc of those with Covid-19 report no symptoms: study

KARACHI: More than nine out of 10 people infected with coronavirus experience no symptoms of the disease, according to a new study by Aga Khan University (AKU) researchers.

Karachi has the most Covid-19 cases in Pakistan and the study saw AKU faculty investigate Covid-19’s prevalence in parts of the city with high and low rates of transmission in the community in April and June 2020.

The study found that 95 per cent of those who tested positive for Covid-19 through blood tests, which register the presence of antibodies to fight the disease, reported feeling no symptoms of the illness such as a cough, fever or sore throat. Rather, they were asymptomatic.

The proportion of asymptomatic cases in Pakistan is much higher than the developed world. Since asymptomatic people do not seek hospital treatment this may explain why Pakistan’s hospitals have not been under the same strain as in Spain and the UK, researchers said.

Results also indicate that children and adolescents are just as likely to catch the disease as adults. Men and women face the same risk of being infected.

The study also confirmed a sharp rise in Covid-19 cases between April and June this year from 0.2 per cent to 8.7 per cent in low community transmission areas such as Ibrahim Hyderi, and from 0.4 per cent to 15.1 per cent in high community transmission sites like Safoora Goth, Faisal Cantonment, Pehlwan Goth and Shanti Nagar. These results are in line with the federal government’s national study where antibody testing found that overall, 11 per cent of Pakistanis had contracted the disease.

“The sharp increase in antibody levels in an area with low reported cases indicates that the virus continues to spread unchecked in populations where testing rates are sub-optimal,” said Dr Imran Nisar, an assistant professor at AKU and co-investigator on the study.

Over 2,000 participants participated in the first two phases of the study. Researchers are currently undertaking the third survey and plan to do a fourth in September 2020. These surveys will show the impact of easing lockdowns on the coronavirus transmission rate in communities.

“Antibody testing or seroprevalence provides a true picture of the burden of Covid-19 as they capture asymptomatic cases who represent silent carriers of the disease,” said Dr Fyezah Jehan, an associate professor at AKU and co-investigator on the study. “Understanding how, when and in what types of settings, COVID-19-19 spreads is critical to developing effective public health and infection prevention measures to break chains of transmission.”

AKU’s Dr Nadia Ansari and Dr Mashal Amin, as well as US-based international collaborators Dr Bailey Fosdick and Dr Daniel Barremore, also contributed to the study.