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# ==================================================================== #
# TITLE #
# Antimicrobial Resistance (AMR) Data Analysis for R #
# #
# SOURCE #
# https://github.com/msberends/AMR #
# #
# LICENCE #
# (c) 2018-2021 Berends MS, Luz CF et al. #
# Developed at the University of Groningen, the Netherlands, in #
# collaboration with non-profit organisations Certe Medical #
# Diagnostics & Advice, and University Medical Center Groningen. #
# #
# This R package is free software; you can freely use and distribute #
# it for both personal and commercial purposes under the terms of the #
# GNU General Public License version 2.0 (GNU GPL-2), as published by #
# the Free Software Foundation. #
# We created this package for both routine data analysis and academic #
# research and it was publicly released in the hope that it will be #
# useful, but it comes WITHOUT ANY WARRANTY OR LIABILITY. #
# #
# Visit our website for the full manual and a complete tutorial about #
# how to conduct AMR data analysis: https://msberends.github.io/AMR/ #
# ==================================================================== #
#' Determine First (Weighted) Isolates
#'
#' Determine first (weighted) isolates of all microorganisms of every patient per episode and (if needed) per specimen type. To determine patient episodes not necessarily based on microorganisms, use [is_new_episode()] that also supports grouping with the `dplyr` package.
#' @inheritSection lifecycle Stable Lifecycle
#' @param x a [data.frame] containing isolates. Can be left blank for automatic determination, see *Examples*.
#' @param col_date column name of the result date (or date that is was received on the lab), defaults to the first column with a date class
#' @param col_patient_id column name of the unique IDs of the patients, defaults to the first column that starts with 'patient' or 'patid' (case insensitive)
#' @param col_mo column name of the IDs of the microorganisms (see [as.mo()]), defaults to the first column of class [`mo`]. Values will be coerced using [as.mo()].
#' @param col_testcode column name of the test codes. Use `col_testcode = NULL` to **not** exclude certain test codes (such as test codes for screening). In that case `testcodes_exclude` will be ignored.
#' @param col_specimen column name of the specimen type or group
#' @param col_icu column name of the logicals (`TRUE`/`FALSE`) whether a ward or department is an Intensive Care Unit (ICU)
#' @param col_keyantibiotics column name of the key antibiotics to determine first (weighted) isolates, see [key_antibiotics()]. Defaults to the first column that starts with 'key' followed by 'ab' or 'antibiotics' (case insensitive). Use `col_keyantibiotics = FALSE` to prevent this.
#' @param episode_days episode in days after which a genus/species combination will be determined as 'first isolate' again. The default of 365 days is based on the guideline by CLSI, see *Source*.
#' @param testcodes_exclude character vector with test codes that should be excluded (case-insensitive)
#' @param icu_exclude logical whether ICU isolates should be excluded (rows with value `TRUE` in the column set with `col_icu`)
#' @param specimen_group value in the column set with `col_specimen` to filter on
#' @param type type to determine weighed isolates; can be `"keyantibiotics"` or `"points"`, see *Details*
#' @param ignore_I logical to determine whether antibiotic interpretations with `"I"` will be ignored when `type = "keyantibiotics"`, see *Details*
#' @param points_threshold points until the comparison of key antibiotics will lead to inclusion of an isolate when `type = "points"`, see *Details*
#' @param info print progress
#' @param include_unknown logical to determine whether 'unknown' microorganisms should be included too, i.e. microbial code `"UNKNOWN"`, which defaults to `FALSE`. For WHONET users, this means that all records with organism code `"con"` (*contamination*) will be excluded at default. Isolates with a microbial ID of `NA` will always be excluded as first isolate.
#' @param ... arguments passed on to [first_isolate()] when using [filter_first_isolate()], or arguments passed on to [key_antibiotics()] when using [filter_first_weighted_isolate()]
#' @details
#' These functions are context-aware. This means that then the `x` argument can be left blank, see *Examples*.
#'
#' The [first_isolate()] function is a wrapper around the [is_new_episode()] function, but more efficient for data sets containing microorganism codes or names.
#'
#' All isolates with a microbial ID of `NA` will be excluded as first isolate.
#'
#' ## Why this is so Important
#' To conduct an analysis of antimicrobial resistance, you should only include the first isolate of every patient per episode [(Hindler *et al.* 2007)](https://pubmed.ncbi.nlm.nih.gov/17304462/). If you would not do this, you could easily get an overestimate or underestimate of the resistance of an antibiotic. Imagine that a patient was admitted with an MRSA and that it was found in 5 different blood cultures the following week. The resistance percentage of oxacillin of all *S. aureus* isolates would be overestimated, because you included this MRSA more than once. It would be [selection bias](https://en.wikipedia.org/wiki/Selection_bias).
#'
#' ## `filter_*()` Shortcuts
#'
#' The functions [filter_first_isolate()] and [filter_first_weighted_isolate()] are helper functions to quickly filter on first isolates.
#'
#' The function [filter_first_isolate()] is essentially equal to either:
#'
#' ```
#' x[first_isolate(x, ...), ]
#'
#' x %>% filter(first_isolate(...))
#' ```
#'
#' The function [filter_first_weighted_isolate()] is essentially equal to:
#'
#' ```
#' x %>%
#' mutate(keyab = key_antibiotics(.)) %>%
#' mutate(only_weighted_firsts = first_isolate(x,
#' col_keyantibiotics = "keyab", ...)) %>%
#' filter(only_weighted_firsts == TRUE) %>%
#' select(-only_weighted_firsts, -keyab)
#' ```
#' @section Key Antibiotics:
#' There are two ways to determine whether isolates can be included as first weighted isolates which will give generally the same results:
#'
#' 1. Using `type = "keyantibiotics"` and argument `ignore_I`
#'
#' Any difference from S to R (or vice versa) will (re)select an isolate as a first weighted isolate. With `ignore_I = FALSE`, also differences from I to S|R (or vice versa) will lead to this. This is a reliable method and 30-35 times faster than method 2. Read more about this in the [key_antibiotics()] function.
#'
#' 2. Using `type = "points"` and argument `points_threshold`
#'
#' A difference from I to S|R (or vice versa) means 0.5 points, a difference from S to R (or vice versa) means 1 point. When the sum of points exceeds `points_threshold`, which defaults to `2`, an isolate will be (re)selected as a first weighted isolate.
#' @rdname first_isolate
#' @seealso [key_antibiotics()]
#' @export
#' @return A [`logical`] vector
#' @source Methodology of this function is strictly based on:
#'
#' **M39 Analysis and Presentation of Cumulative Antimicrobial Susceptibility Test Data, 4th Edition**, 2014, *Clinical and Laboratory Standards Institute (CLSI)*. <https://clsi.org/standards/products/microbiology/documents/m39/>.
#' @inheritSection AMR Read more on Our Website!
#' @examples
#' # `example_isolates` is a data set available in the AMR package.
#' # See ?example_isolates.
#'
#' example_isolates[first_isolate(example_isolates), ]
#'
#' \donttest{
#' # faster way, only works in R 3.2 and later:
#' example_isolates[first_isolate(), ]
#'
#' # get all first Gram-negatives
#' example_isolates[which(first_isolate() & mo_is_gram_negative()), ]
#'
#' if (require("dplyr")) {
#' # filter on first isolates using dplyr:
#' example_isolates %>%
#' filter(first_isolate())
#'
#' # short-hand versions:
#' example_isolates %>%
#' filter_first_isolate()
#' example_isolates %>%
#' filter_first_weighted_isolate()
#'
#' # grouped determination of first isolates (also prints group names):
#' example_isolates %>%
#' group_by(hospital_id) %>%
#' mutate(first = first_isolate())
#'
#' # now let's see if first isolates matter:
#' A <- example_isolates %>%
#' group_by(hospital_id) %>%
#' summarise(count = n_rsi(GEN), # gentamicin availability
#' resistance = resistance(GEN)) # gentamicin resistance
#'
#' B <- example_isolates %>%
#' filter_first_weighted_isolate() %>% # the 1st isolate filter
#' group_by(hospital_id) %>%
#' summarise(count = n_rsi(GEN), # gentamicin availability
#' resistance = resistance(GEN)) # gentamicin resistance
#'
#' # Have a look at A and B.
#' # B is more reliable because every isolate is counted only once.
#' # Gentamicin resistance in hospital D appears to be 3.7% higher than
#' # when you (erroneously) would have used all isolates for analysis.
#' }
#' }
first_isolate <- function(x = NULL,
col_date = NULL,
col_patient_id = NULL,
col_mo = NULL,
col_testcode = NULL,
col_specimen = NULL,
col_icu = NULL,
col_keyantibiotics = NULL,
episode_days = 365,
testcodes_exclude = NULL,
icu_exclude = FALSE,
specimen_group = NULL,
type = "keyantibiotics",
ignore_I = TRUE,
points_threshold = 2,
info = interactive(),
include_unknown = FALSE,
...) {
if (is_null_or_grouped_tbl(x)) {
# when `x` is left blank, auto determine it (get_current_data() also contains dplyr::cur_data_all())
# is also fix for using a grouped df as input (a dot as first argument)
x <- tryCatch(get_current_data(arg_name = "x", call = -2), error = function(e) x)
}
meet_criteria(x, allow_class = "data.frame") # also checks dimensions to be >0
meet_criteria(col_date, allow_class = "character", has_length = 1, allow_NULL = TRUE, is_in = colnames(x))
meet_criteria(col_patient_id, allow_class = "character", has_length = 1, allow_NULL = TRUE, is_in = colnames(x))
meet_criteria(col_mo, allow_class = "character", has_length = 1, allow_NULL = TRUE, is_in = colnames(x))
meet_criteria(col_testcode, allow_class = "character", has_length = 1, allow_NULL = TRUE, is_in = colnames(x))
if (isFALSE(col_specimen)) {
col_specimen <- NULL
}
meet_criteria(col_specimen, allow_class = "character", has_length = 1, allow_NULL = TRUE, is_in = colnames(x))
meet_criteria(col_icu, allow_class = "character", has_length = 1, allow_NULL = TRUE, is_in = colnames(x))
if (isFALSE(col_keyantibiotics)) {
col_keyantibiotics <- NULL
}
meet_criteria(col_keyantibiotics, allow_class = "character", has_length = 1, allow_NULL = TRUE, is_in = colnames(x))
meet_criteria(episode_days, allow_class = c("numeric", "integer"), has_length = 1, is_positive = TRUE, is_finite = TRUE)
meet_criteria(testcodes_exclude, allow_class = "character", allow_NULL = TRUE)
meet_criteria(icu_exclude, allow_class = "logical", has_length = 1)
meet_criteria(specimen_group, allow_class = "character", has_length = 1, allow_NULL = TRUE)
meet_criteria(type, allow_class = "character", has_length = 1)
meet_criteria(ignore_I, allow_class = "logical", has_length = 1)
meet_criteria(points_threshold, allow_class = c("numeric", "integer"), has_length = 1, is_positive = TRUE, is_finite = TRUE)
meet_criteria(info, allow_class = "logical", has_length = 1)
meet_criteria(include_unknown, allow_class = "logical", has_length = 1)
# remove data.table, grouping from tibbles, etc.
x <- as.data.frame(x, stringsAsFactors = FALSE)
dots <- unlist(list(...))
if (length(dots) != 0) {
# backwards compatibility with old arguments
dots.names <- names(dots)
if ("filter_specimen" %in% dots.names) {
specimen_group <- dots[which(dots.names == "filter_specimen")]
}
if ("tbl" %in% dots.names) {
x <- dots[which(dots.names == "tbl")]
}
}
# try to find columns based on type
# -- mo
if (is.null(col_mo)) {
col_mo <- search_type_in_df(x = x, type = "mo")
stop_if(is.null(col_mo), "`col_mo` must be set")
}
# -- date
if (is.null(col_date)) {
col_date <- search_type_in_df(x = x, type = "date")
stop_if(is.null(col_date), "`col_date` must be set")
}
# -- patient id
if (is.null(col_patient_id)) {
if (all(c("First name", "Last name", "Sex") %in% colnames(x))) {
# WHONET support
x$patient_id <- paste(x$`First name`, x$`Last name`, x$Sex)
col_patient_id <- "patient_id"
message_("Using combined columns '", font_bold("First name"), "', '", font_bold("Last name"), "' and '", font_bold("Sex"), "' as input for `col_patient_id`")
} else {
col_patient_id <- search_type_in_df(x = x, type = "patient_id")
}
stop_if(is.null(col_patient_id), "`col_patient_id` must be set")
}
# -- key antibiotics
if (is.null(col_keyantibiotics)) {
col_keyantibiotics <- search_type_in_df(x = x, type = "keyantibiotics")
}
# -- specimen
if (is.null(col_specimen) & !is.null(specimen_group)) {
col_specimen <- search_type_in_df(x = x, type = "specimen")
}
# check if columns exist
check_columns_existance <- function(column, tblname = x) {
if (!is.null(column)) {
stop_ifnot(column %in% colnames(tblname),
"Column '", column, "' not found.", call = FALSE)
}
}
check_columns_existance(col_date)
check_columns_existance(col_patient_id)
check_columns_existance(col_mo)
check_columns_existance(col_testcode)
check_columns_existance(col_icu)
check_columns_existance(col_keyantibiotics)
# convert dates to Date
dates <- as.Date(x[, col_date, drop = TRUE])
dates[is.na(dates)] <- as.Date("1970-01-01")
x[, col_date] <- dates
# create original row index
x$newvar_row_index <- seq_len(nrow(x))
x$newvar_mo <- as.mo(x[, col_mo, drop = TRUE])
x$newvar_genus_species <- paste(mo_genus(x$newvar_mo), mo_species(x$newvar_mo))
x$newvar_date <- x[, col_date, drop = TRUE]
x$newvar_patient_id <- x[, col_patient_id, drop = TRUE]
if (is.null(col_testcode)) {
testcodes_exclude <- NULL
}
# remove testcodes
if (!is.null(testcodes_exclude) & info == TRUE) {
message_("[Criterion] Exclude test codes: ", toString(paste0("'", testcodes_exclude, "'")),
add_fn = font_black,
as_note = FALSE)
}
if (is.null(col_specimen)) {
specimen_group <- NULL
}
# filter on specimen group and keyantibiotics when they are filled in
if (!is.null(specimen_group)) {
check_columns_existance(col_specimen, x)
if (info == TRUE) {
message_("[Criterion] Exclude other than specimen group '", specimen_group, "'",
add_fn = font_black,
as_note = FALSE)
}
}
if (!is.null(col_keyantibiotics)) {
x$newvar_key_ab <- x[, col_keyantibiotics, drop = TRUE]
}
if (is.null(testcodes_exclude)) {
testcodes_exclude <- ""
}
# arrange data to the right sorting
if (is.null(specimen_group)) {
x <- x[order(x$newvar_patient_id,
x$newvar_genus_species,
x$newvar_date), ]
rownames(x) <- NULL
row.start <- 1
row.end <- nrow(x)
} else {
# filtering on specimen and only analyse these rows to save time
x <- x[order(pm_pull(x, col_specimen),
x$newvar_patient_id,
x$newvar_genus_species,
x$newvar_date), ]
rownames(x) <- NULL
suppressWarnings(
row.start <- which(x %pm>% pm_pull(col_specimen) == specimen_group) %pm>% min(na.rm = TRUE)
)
suppressWarnings(
row.end <- which(x %pm>% pm_pull(col_specimen) == specimen_group) %pm>% max(na.rm = TRUE)
)
}
# speed up - return immediately if obvious
if (abs(row.start) == Inf | abs(row.end) == Inf) {
if (info == TRUE) {
message_("=> Found ", font_bold("no isolates"),
add_fn = font_black,
as_note = FALSE)
}
return(rep(FALSE, nrow(x)))
}
if (row.start == row.end) {
if (info == TRUE) {
message_("=> Found ", font_bold("1 isolate"), ", as the data only contained 1 row",
add_fn = font_black,
as_note = FALSE)
}
return(TRUE)
}
if (length(c(row.start:row.end)) == pm_n_distinct(x[c(row.start:row.end), col_mo, drop = TRUE])) {
if (info == TRUE) {
message_("=> Found ", font_bold(paste(length(c(row.start:row.end)), "isolates")),
", as all isolates were different microorganisms",
add_fn = font_black,
as_note = FALSE)
}
return(rep(TRUE, length(c(row.start:row.end))))
}
# did find some isolates - add new index numbers of rows
x$newvar_row_index_sorted <- seq_len(nrow(x))
scope.size <- nrow(x[which(x$newvar_row_index_sorted %in% c(row.start + 1:row.end) &
!is.na(x$newvar_mo)), , drop = FALSE])
# Analysis of first isolate ----
x$other_pat_or_mo <- ifelse(x$newvar_patient_id == pm_lag(x$newvar_patient_id) &
x$newvar_genus_species == pm_lag(x$newvar_genus_species),
FALSE,
TRUE)
x$episode_group <- paste(x$newvar_patient_id, x$newvar_genus_species)
x$more_than_episode_ago <- unlist(lapply(unique(x$episode_group),
function(g,
df = x,
days = episode_days) {
is_new_episode(x = df[which(df$episode_group == g), ]$newvar_date,
episode_days = days)
}))
weighted.notice <- ""
if (!is.null(col_keyantibiotics)) {
weighted.notice <- "weighted "
if (info == TRUE) {
if (type == "keyantibiotics") {
message_("[Criterion] Base inclusion on key antibiotics, ",
ifelse(ignore_I == FALSE, "not ", ""),
"ignoring I",
add_fn = font_black,
as_note = FALSE)
}
if (type == "points") {
message_("[Criterion] Base inclusion on key antibiotics, using points threshold of "
, points_threshold,
add_fn = font_black,
as_note = FALSE)
}
}
type_param <- type
x$other_key_ab <- !key_antibiotics_equal(y = x$newvar_key_ab,
z = pm_lag(x$newvar_key_ab),
type = type_param,
ignore_I = ignore_I,
points_threshold = points_threshold,
info = info)
# with key antibiotics
x$newvar_first_isolate <- pm_if_else(x$newvar_row_index_sorted >= row.start &
x$newvar_row_index_sorted <= row.end &
x$newvar_genus_species != "" &
(x$other_pat_or_mo | x$more_than_episode_ago | x$other_key_ab),
TRUE,
FALSE)
} else {
# no key antibiotics
x$newvar_first_isolate <- pm_if_else(x$newvar_row_index_sorted >= row.start &
x$newvar_row_index_sorted <= row.end &
x$newvar_genus_species != "" &
(x$other_pat_or_mo | x$more_than_episode_ago),
TRUE,
FALSE)
}
# first one as TRUE
x[row.start, "newvar_first_isolate"] <- TRUE
# no tests that should be included, or ICU
if (!is.null(col_testcode)) {
x[which(x[, col_testcode] %in% tolower(testcodes_exclude)), "newvar_first_isolate"] <- FALSE
}
if (!is.null(col_icu)) {
if (icu_exclude == TRUE) {
message_("[Criterion] Exclude isolates from ICU.",
add_fn = font_black,
as_note = FALSE)
x[which(as.logical(x[, col_icu, drop = TRUE])), "newvar_first_isolate"] <- FALSE
} else {
message_("[Criterion] Include isolates from ICU.",
add_fn = font_black,
as_note = FALSE)
}
}
decimal.mark <- getOption("OutDec")
big.mark <- ifelse(decimal.mark != ",", ",", ".")
if (info == TRUE) {
# print group name if used in dplyr::group_by()
cur_group <- import_fn("cur_group", "dplyr", error_on_fail = FALSE)
if (!is.null(cur_group)) {
group_df <- tryCatch(cur_group(), error = function(e) data.frame())
if (NCOL(group_df) > 0) {
# transform factors to characters
group <- vapply(FUN.VALUE = character(1), group_df, function(x) {
if (is.numeric(x)) {
format(x)
} else if (is.logical(x)) {
as.character(x)
} else {
paste0('"', x, '"')
}
})
cat("\nGroup: ", paste0(names(group), " = ", group, collapse = ", "), "\n", sep = "")
}
}
}
# handle empty microorganisms
if (any(x$newvar_mo == "UNKNOWN", na.rm = TRUE) & info == TRUE) {
message_(ifelse(include_unknown == TRUE, "Included ", "Excluded "),
format(sum(x$newvar_mo == "UNKNOWN", na.rm = TRUE),
decimal.mark = decimal.mark, big.mark = big.mark),
" isolates with a microbial ID 'UNKNOWN' (in column '", font_bold(col_mo), "')")
}
x[which(x$newvar_mo == "UNKNOWN"), "newvar_first_isolate"] <- include_unknown
# exclude all NAs
if (any(is.na(x$newvar_mo)) & info == TRUE) {
message_("Excluded ", format(sum(is.na(x$newvar_mo), na.rm = TRUE),
decimal.mark = decimal.mark, big.mark = big.mark),
" isolates with a microbial ID 'NA' (in column '", font_bold(col_mo), "')")
}
x[which(is.na(x$newvar_mo)), "newvar_first_isolate"] <- FALSE
# arrange back according to original sorting again
x <- x[order(x$newvar_row_index), ]
rownames(x) <- NULL
if (info == TRUE) {
n_found <- sum(x$newvar_first_isolate, na.rm = TRUE)
p_found_total <- percentage(n_found / nrow(x[which(!is.na(x$newvar_mo)), , drop = FALSE]), digits = 1)
p_found_scope <- percentage(n_found / scope.size, digits = 1)
if (!p_found_total %like% "[.]") {
p_found_total <- gsub("%", ".0%", p_found_total, fixed = TRUE)
}
if (!p_found_scope %like% "[.]") {
p_found_scope <- gsub("%", ".0%", p_found_scope, fixed = TRUE)
}
# mark up number of found
n_found <- format(n_found, big.mark = big.mark, decimal.mark = decimal.mark)
if (p_found_total != p_found_scope) {
msg_txt <- paste0("=> Found ",
font_bold(paste0(n_found, " first ", weighted.notice, "isolates")),
" (", p_found_scope, " within scope and ", p_found_total, " of total where a microbial ID was available)")
} else {
msg_txt <- paste0("=> Found ",
font_bold(paste0(n_found, " first ", weighted.notice, "isolates")),
" (", p_found_total, " of total where a microbial ID was available)")
}
message_(msg_txt, add_fn = font_black, as_note = FALSE)
}
x$newvar_first_isolate
}
#' @rdname first_isolate
#' @export
filter_first_isolate <- function(x = NULL,
col_date = NULL,
col_patient_id = NULL,
col_mo = NULL,
...) {
if (is_null_or_grouped_tbl(x)) {
# when `x` is left blank, auto determine it (get_current_data() also contains dplyr::cur_data_all())
# is also fix for using a grouped df as input (a dot as first argument)
x <- tryCatch(get_current_data(arg_name = "x", call = -2), error = function(e) x)
}
meet_criteria(x, allow_class = "data.frame") # also checks dimensions to be >0
meet_criteria(col_date, allow_class = "character", has_length = 1, allow_NULL = TRUE, is_in = colnames(x))
meet_criteria(col_patient_id, allow_class = "character", has_length = 1, allow_NULL = TRUE, is_in = colnames(x))
meet_criteria(col_mo, allow_class = "character", has_length = 1, allow_NULL = TRUE, is_in = colnames(x))
subset(x, first_isolate(x = x,
col_date = col_date,
col_patient_id = col_patient_id,
col_mo = col_mo,
...))
}
#' @rdname first_isolate
#' @export
filter_first_weighted_isolate <- function(x = NULL,
col_date = NULL,
col_patient_id = NULL,
col_mo = NULL,
col_keyantibiotics = NULL,
...) {
if (is_null_or_grouped_tbl(x)) {
# when `x` is left blank, auto determine it (get_current_data() also contains dplyr::cur_data_all())
# is also fix for using a grouped df as input (a dot as first argument)
x <- tryCatch(get_current_data(arg_name = "x", call = -2), error = function(e) x)
}
meet_criteria(x, allow_class = "data.frame") # also checks dimensions to be >0
meet_criteria(col_date, allow_class = "character", has_length = 1, allow_NULL = TRUE, is_in = colnames(x))
meet_criteria(col_patient_id, allow_class = "character", has_length = 1, allow_NULL = TRUE, is_in = colnames(x))
meet_criteria(col_mo, allow_class = "character", has_length = 1, allow_NULL = TRUE, is_in = colnames(x))
meet_criteria(col_keyantibiotics, allow_class = "character", has_length = 1, allow_NULL = TRUE, is_in = colnames(x))
y <- x
if (is.null(col_keyantibiotics)) {
# first try to look for it
col_keyantibiotics <- search_type_in_df(x = x, type = "keyantibiotics")
# still NULL? Then create it since we are calling filter_first_WEIGHTED_isolate()
if (is.null(col_keyantibiotics)) {
y$keyab <- suppressMessages(key_antibiotics(x,
col_mo = col_mo,
...))
col_keyantibiotics <- "keyab"
}
}
subset(x, first_isolate(x = y,
col_date = col_date,
col_patient_id = col_patient_id))
}
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