ABSTRACT
Amid the COVID-19 pandemic, cancer continues to be the most devastating disease worldwide. Liquid biopsy of circulating tumor cells (CTCs) has recently become a painless and noninvasive tool for obtaining carcinoma cell samples for molecular profiling. Here, we report efficient detection and collection of cancer cells in blood samples by combining stem cell antigen (CD44)-specific immunosilica particles and immunofluorescent quantum dots with spectrally and temporally resolved single-photon counting. We accurately detect 1-10 cells among 100 cancer cells of the breast, lungs, or cervix in 1 mL blood samples. In addition, the bright and narrowband emission of CdSe/ZnS quantum dots enables temporally and spectrally resolved photon counting for multiplexed cancer cell detection. The cancer cell-specific and large immunosilica particles helped us collect the specific cells. We validate the detection efficiency and multimodality of this strategy by time-stamped and energy-dispersed single-photon counting of orange- and red-emitting quantum dots and green-fluorescing nuclei stained with Syto-13/25 dye. Thus, the present work highlights the prospects of multimodal CTC detection for noninvasive cancer screening and postsurgical or therapeutic follow-up.
ABSTRACT
The ongoing COVID-19 pandemic, which began in early 2020, is a global public health crisis. To prevent the spread of COVID-19, it is necessary to promote vaccine administration and preventive behaviors (e.g., mask, handwashing, social distancing). However, some people have negative attitudes toward vaccine administration and preventive behaviors. Based on the information-deficit model, the present study investigated how scientific literacy and perceived understanding of COVID-19 are associated with attitudes toward COVID-19 vaccinations and preventive behaviors. The findings demonstrated that both scientific literacy and perceived understanding of COVID-19 vaccines were positively associated with attitudes toward COVID-19 vaccines. Additionally, perceived understanding of COVID-19 preventive behaviors (but not scientific literacy) was positively associated with attitudes toward/practice of COVID-19 preventive behaviors. Collectively, our findings revealed the role of cognitive factors in preventing the global public health crisis and demonstrated the roles of objective and subjective knowledge on attitudes toward COVID-19 vaccinations and preventive behaviors.