The mysterious deaths of children in Bihar’s Muzaffarpur district during the months of May and June, were caused buy the consumption of litchis, according to a study published in Lancet Global Health at the end of January.
Between 26 May and 17 July, 2014, 390 patients were brought to hospitals in Muzaffarpur. Of these, 122 or 31 percent died due to swelling of the brain. In 66 percent of them, blood sugar levels were 70 mg/dl. The median level was 48 mg/dl and the lowest was 8 mg/dl.
Upon investigation it was found that the patients, 15 years and younger, had spent most of the time prior to the onset of llness in litchi orchards. In the evening, feeling full, they had skipped dinner, which caused a drop in blood sugar levels, particularly in those with low hepatic glycogen reserves. Investigations showed that toxins present in litchis blocked enzymes from breaking down fatty acids to release glucose into the blood steam. As blood sugar levels dropped dangerously low, the brain swelled, resulting in seizures, coma and even death.
Following similar occurrences earlier, NCDC has begun investigations in 2013. Spinal fluid drawn from the patients did not reveal elevated white blood cell counts, ruling out the possibility of infection. So the search for non-infectious causes began.
Later that year, the US Centers for Disease Control and Prevention alerted NCDC investigators to a widely reported case of toxic hypoglycaemic syndrome in the West Indies caused by consumption of the ackee fruit. It was related to the litchi family. The fruit had a toxin called hypogyclin A. Both hypoglycin A and methylenecyclopropylglycine (MCPG) are naturally present in litchi, especially in unripe fruit.
Though the cause was not known, NCDC recommended dextrose therapy for affected children The mortality fell from 44 percent in 2013 to 31 percent in 2014. So the administration of dextrose to treat the illness, Padmini Srikantiah, Global Disease Detection Programme – India, CDC , Atlanta told The Hindu.
“Our data supports a public health recommendation — minimizing litchi consumption, eating evening meal throughout the outbreak period and implementing rapid glucose correction for suspected illness. These recommendations are specific to children in Muzaffarpur. ” Srikantiah added.
(Top photo: Litchi picking at Nayagaon, Samastipur district, Bihar, June 2015. Photo by Vivian Fernandes)