Please see below for the latest update on Merced, Stanislaus, and Yolo County wastewater data.

  • Weeks 103-104: 10/08 - 10/21
  • Weeks 105-106: 10/22 - 11/04

General Update at County Level

Aggregated trend lines for counties are calculated using the right-aligned 10-day trimmed average for each site. For each date, an individual site trimmed smoothed value for the day is multiplied by the plant’s population, then these are summed and divided by the total population of all selected sites. This calculation results in the trimmed weighted average \(target/PMMoV_{w,t}\) for day t, as in the following equation for the m selected plants: \[\text{trimmed } target/PMMoV_{t} = \frac {\sum_{i=1}^m target/PMMoV_{i,t}}{\sum_{i=1}^m pop_i}\]

Percentage of change

Percent change
Virus Merced County Stanislaus County Yolo County
SARS-CoV-2 +0.6% 15.4% 29.1%
Influenza A +43.6% +44.2% +147%
Influenza B +0.6% 15.4% 29.1%
RSV +22.7% 69.6% 39.8%
HMPV 0% 7.4% 80.6%
Norovirus 42.8% 38.9% +90.2%
Hepatitis A Virus ND 0% 0%
Candida auris +52% +39.1% +87.2%
Human Adenovirus Group F +52.3% 38.2% +27.4%
Rotavirus ND 7.7% 1.9%
Enterovirus D68 ND ND ND
Parainfluenza +53.8% 1.7% 28.5%
Percent change is calculated here using average of measurements over the past two weeks compared to the average of measurements from the prior two weeks.
ND- Non-detect (below detection limit)
+LL increasing but at low levels
Weeks 103-104: 10/08 - 10/21
Weeks 105-106: 10/22 - 11/04

Current wastewater level

Current wastewater level
Virus Merced County Stanislaus County Yolo County
SARS-CoV-2 Medium Low Medium
Influenza A High Low High
Influenza B Medium Low Medium
RSV High Low Medium
HMPV Low Low Low
Norovirus Low Low Low
Hepatitis A Virus Low High High
Candida auris High High High
Human Adenovirus Group F High High High
Rotavirus Low Low High
Enterovirus D68 Low Low Low
Parainfluenza High High High
The current wastewater levels are estimated using the 10-day rolling average (10-d.m.a). The 33rd and 66th percentiles are calculated over the past 365 days before 14 days ago. For counties with less than 365 days, all days before 14 days ago are used. The current wastewater level is classified as:
- Low: The current 10-dma is below 33rd percentile
- Medium: The current 10-dma is between the 33rd and 66th percentile
- High: The current 10-dma is above 66th Percentile

Trend test at County level

Mann-Kendall trend test

Mann-Kendall trend test
Virus Merced County Stanislaus County Yolo County
SARS-CoV-2 No Trend Very likely downward Likely downward
Influenza A Likely upward Likely downward No Trend
Influenza B No Trend Very likely downward Likely downward
RSV No Trend No Trend No Trend
HMPV No Trend No Trend No Trend
Norovirus Very likely downward Likely downward Likely downward
Hepatitis A Virus No Trend No Trend No Trend
Candida auris Likely downward No Trend Upward
Human Adenovirus Group F Very likely upward Likely upward Likely upward
Rotavirus No Trend No Trend No Trend
Enterovirus D68 No Trend No Trend No Trend
Parainfluenza Upward No Trend Very likely downward
Week 106: 10/22 - 11/04
* The Mann-Kendall (MK) trend test is a nonparametric test that evaluates whether there is a monotonic trend in a time-series dataset. We applied the MK trend test to raw N/PMMoV data and used a 14-day lookback period. We interpreted positive values of the test statistic, tau (τ), with p ≤ 0.005, p ≤ 0.05, and p ≤ 0.01 as upward, likely upward, and very likely upward trends, respectively. We interpreted negative τ values with p ≤ 0.005, p ≤ 0.05, and p ≤ 0.01 as downward, likely downward, and very likely downward trends, respectively.

Percent change (PC)

Percent change in the last 14 days
Virus Merced County Stanislaus County Yolo County
SARS-CoV-2 No Trend Very likely downward Likely downward
Influenza A Very likely upward Likely downward No Trend
Influenza B No Trend Very likely downward Likely downward
RSV No Trend No Trend No Trend
HMPV No Trend No Trend Upward
Norovirus Very likely downward Likely downward Very likely downward
Hepatitis A Virus No Trend No Trend No Trend
Candida auris Likely downward No Trend Upward
Human Adenovirus Group F Very likely upward No Trend Very likely upward
Rotavirus No Trend No Trend No Trend
Enterovirus D68 No Trend No Trend No Trend
Parainfluenza Very likely upward Likely downward Very likely downward
Week 106: 10/22 - 11/04
* The slope is calculated from a least-squares linear regression of log10-transformed values of the N/PMMoV data versus day. We used a 14-day look-back period to calculate the slope. For each slope estimate, we extracted the 90%, 95%, and 99% confidence intervals (CIs) to calculate the 90%, 95%, and 99% CIs for each PC estimate. We interpreted PC values greater than 0 for the 90%, 95%, and 99% upper CIs as upward, likely upward, and very likely upward trends, respectively. We interpreted PC values less than 0 for the 90%, 95%, and 99% lower CIs as downward, likely downward, and very likely downward trends day and previous n - 1 days.

Relative Strength Index

The Relative Strength Index
Virus Merced County Stanislaus County Yolo County
SARS-CoV-2 No Trend Downward No Trend
Influenza A Upward No Trend No Trend
Influenza B No Trend Downward No Trend
RSV Upward Downward No Trend
HMPV No Trend Very likely downward No Trend
Norovirus Downward Downward No Trend
Hepatitis A Virus No Trend Very likely upward Very likely upward
Candida auris No Trend Downward No Trend
Human Adenovirus Group F Upward No Trend No Trend
Rotavirus No Trend Very likely downward No Trend
Enterovirus D68 No Trend No Trend No Trend
Parainfluenza No Trend Downward No Trend
Week 106: 10/22 - 11/04
* The Relative Strength Index (RSI) calculates a ratio of the recent upward price movements to the absolute price movement. Developed by J. Welles Wilder.

Trend at County level

Merced County

Stanislaus County

Yolo County

General Update at City Level

Percentage of change

Percent change
Virus Merced County Stanislaus County Yolo County
Merced Los Banos Modesto Turlock Davis Esparto Winters Woodland
SARS-CoV-2 +21.7% +9.5% +130% 75.4% 36.1% 29.8% 75.7% +11.6%
Influenza A +LL +LL +41.3% +LL +LL +191% 0% +265%
Influenza B 0% +LL ND 14.3% 0% 0% ND 0%
RSV +LL +224% 0% +LL +LL 0% +LL +1504%
HMPV +LL 45.9% +123% 0% +LL 0% +LL 97.5%
Norovirus 72% 29.8% +25.1% 76.5% +11.8% +10.5% +122% 24.8%
Hepatitis A Virus ND ND ND +33.8% ND ND ND 16.7%
Candida auris ND ND ND ND ND ND ND ND
Human Adenovirus Group F +2% 8.9% +112% +2.4% 68% 36.5% 0% +135%
Rotavirus +194% +1153% +13.1% 97.8% +818% 0% +25% 84.8%
Enterovirus D68 ND ND 16.7% ND 0% ND ND 0%
Parainfluenza 14% +45.1% 36.7% 18.1% +70.6% +149% 9.7% 76.8%
Percent change is calculated here using average of measurements over the past two weeks compared to the average of measurements from the prior two weeks.
ND- Non-detect (below detection limit)
+LL increasing but at low levels
Weeks 103-104: 10/08 - 10/21
Weeks 105-106: 10/22 - 11/04

Current wastewater level

Current wastewater level
Virus Merced County Stanislaus County Yolo County
Merced Los Banos Modesto Turlock Davis Esparto Winters Woodland
SARS-CoV-2 Medium Medium Medium Low Medium Low Low High
Influenza A High High High High High Low Low High
Influenza B Low High Low Low Low Low Low Low
RSV High High Low Low Medium Low Low High
HMPV Low Low Low Low Medium Low Low Low
Norovirus Low Low Low Low Medium Low High Low
Hepatitis A Virus Low Low Low Low Low Low Low Low
Candida auris Low Low Low Low Low Low Low Low
Human Adenovirus Group F Low High High High Low Low Low High
Rotavirus Medium High High Low High Low Low Medium
Enterovirus D68 Low Low Low Low Low Low Low Low
Parainfluenza High High Medium Low High High Medium Medium
The current wastewater levels are estimated using the 10-day rolling average (10-d.m.a). The 33rd and 66th percentiles are calculated over the past 365 days before 14 days ago. For counties with less than 365 days, all days before 14 days ago are used. The current wastewater level is classified as:
- Low: The current 10-dma is below 33rd percentile
- Medium: The current 10-dma is between the 33rd and 66th percentile
- High: The current 10-dma is above 66th Percentile

Trend test at City level

Mann-Kendall trend test

Mann-Kendall trend test
Virus Merced County Stanislaus County Yolo County
Merced Los Banos Modesto Turlock Davis Esparto Winters Woodland
SARS-CoV-2 Likely upward No Trend No Trend Very likely downward Likely downward Likely downward Very likely downward Likely upward
Influenza A No Trend Likely upward No Trend Upward No Trend No Trend No Trend No Trend
Influenza B No Trend Upward No Trend No Trend No Trend No Trend No Trend No Trend
RSV Likely upward Upward No Trend No Trend Likely upward No Trend No Trend Likely upward
HMPV No Trend No Trend No Trend No Trend No Trend No Trend No Trend No Trend
Norovirus Very likely downward No Trend Upward Very likely downward No Trend No Trend No Trend Likely downward
Hepatitis A Virus No Trend No Trend No Trend No Trend No Trend No Trend No Trend No Trend
Candida auris No Trend No Trend No Trend No Trend No Trend No Trend No Trend No Trend
Human Adenovirus Group F Likely upward Likely downward Very likely upward Likely downward Likely downward No Trend No Trend Likely upward
Rotavirus Very likely upward Likely upward Very likely upward Likely downward Very likely upward No Trend No Trend Very likely downward
Enterovirus D68 No Trend No Trend No Trend No Trend No Trend No Trend No Trend No Trend
Parainfluenza No Trend Very likely upward Likely downward Downward Very likely upward No Trend No Trend Very likely downward
Week 106: 10/22 - 11/04
* The Mann-Kendall (MK) trend test is a nonparametric test that evaluates whether there is a monotonic trend in a time-series dataset. We applied the MK trend test to raw N/PMMoV data and used a 14-day lookback period. We interpreted positive values of the test statistic, tau (τ), with p ≤ 0.005, p ≤ 0.05, and p ≤ 0.01 as upward, likely upward, and very likely upward trends, respectively. We interpreted negative τ values with p ≤ 0.005, p ≤ 0.05, and p ≤ 0.01 as downward, likely downward, and very likely downward trends, respectively.

Percent change (PC)

Percent change in the last 14 days
Virus Merced County Stanislaus County Yolo County
Merced Los Banos Modesto Turlock Davis Esparto Winters Woodland
SARS-CoV-2 Very likely upward No Trend No Trend Very likely downward Very likely downward Very likely downward Very likely downward Very likely upward
Influenza A No Trend Upward No Trend No Trend No Trend No Trend No Trend Likely upward
Influenza B No Trend Upward No Trend No Trend No Trend No Trend No Trend No Trend
RSV Likely upward No Trend No Trend No Trend Upward No Trend No Trend Likely upward
HMPV No Trend No Trend No Trend No Trend No Trend No Trend No Trend No Trend
Norovirus Very likely downward No Trend Likely upward Very likely downward No Trend No Trend No Trend Very likely downward
Hepatitis A Virus No Trend No Trend No Trend No Trend No Trend No Trend No Trend No Trend
Candida auris No Trend No Trend No Trend No Trend No Trend No Trend No Trend No Trend
Human Adenovirus Group F Very likely upward Very likely downward Very likely upward Very likely downward Very likely downward Upward No Trend Likely upward
Rotavirus Very likely upward Very likely upward Very likely upward No Trend Very likely upward No Trend No Trend Very likely downward
Enterovirus D68 No Trend No Trend No Trend No Trend No Trend No Trend No Trend No Trend
Parainfluenza No Trend Very likely upward Likely downward Downward Very likely upward No Trend No Trend Very likely downward
Week 106: 10/22 - 11/04
* The slope is calculated from a least-squares linear regression of log10-transformed values of the N/PMMoV data versus day. We used a 14-day look-back period to calculate the slope. For each slope estimate, we extracted the 90%, 95%, and 99% confidence intervals (CIs) to calculate the 90%, 95%, and 99% CIs for each PC estimate. We interpreted PC values greater than 0 for the 90%, 95%, and 99% upper CIs as upward, likely upward, and very likely upward trends, respectively. We interpreted PC values less than 0 for the 90%, 95%, and 99% lower CIs as downward, likely downward, and very likely downward trends day and previous n - 1 days.

Relative Strength Index

The Relative Strength Index
Virus Merced County Stanislaus County Yolo County
Merced Los Banos Modesto Turlock Davis Esparto Winters Woodland
SARS-CoV-2 No Trend No Trend No Trend Downward No Trend No Trend Downward No Trend
Influenza A Upward Upward No Trend No Trend No Trend No Trend Very likely downward No Trend
Influenza B No Trend Likely upward No Trend No Trend No Trend No Trend No Trend No Trend
RSV No Trend Upward No Trend No Trend No Trend No Trend No Trend Very likely upward
HMPV No Trend No Trend No Trend No Trend Likely upward No Trend No Trend No Trend
Norovirus Downward No Trend No Trend Downward No Trend No Trend Upward No Trend
Hepatitis A Virus No Trend No Trend No Trend No Trend No Trend No Trend No Trend No Trend
Candida auris No Trend No Trend No Trend No Trend No Trend No Trend No Trend No Trend
Human Adenovirus Group F No Trend No Trend Upward No Trend Downward No Trend Likely downward No Trend
Rotavirus No Trend Upward No Trend No Trend No Trend No Trend No Trend Downward
Enterovirus D68 No Trend No Trend No Trend No Trend Very likely downward No Trend No Trend No Trend
Parainfluenza No Trend Upward No Trend No Trend Upward No Trend No Trend No Trend
Week 106: 10/22 - 11/04
* The Relative Strength Index (RSI) calculates a ratio of the recent upward price movements to the absolute price movement. Developed by J. Welles Wilder.

Merced County

SARS-CoV-2

Merced’s average SARS-CoV-2 concentrations (N/PMMoV) increased ⬆️ by 21.7% between the most recent two weeks and the two weeks prior to that. Los Banos’s average increased ⬆️ by 9.5%.

Fig 1. Merced

Fig 2. Los Banos

Influenza A

Merced’s average Influenza A concentrations (Flu A/PMMoV) +LL between the most recent two weeks and the two weeks prior to that. Los Banos’ average +LL.

Influenza B

Merced’s average Influenza B concentrations (Flu B/PMMoV) remained the same 🔄 between the most recent two weeks and the two weeks prior to that. Los Banos’ average +LL.

RSV

Merced’s average RSV concentrations (RSV/PMMoV) +LL between the most recent two weeks and the two weeks prior to that. Los Banos’ average increased ⬆️ by 224%.

HMPV

Merced’s HMPV concentrations (HMPV/PMMoV) +LL between the most recent two weeks and the two weeks prior to that. Los Banos’s average decreased ⬇️ by 45.9%.

Norovirus

Merced’s average Norovirus concentrations (Norovirus/PMMoV) decreased ⬇️ by 72% between the most recent two weeks and the two weeks prior to that. Los Banos’ average decreased ⬇️ by 29.8%.

Hepatitis A Virus

Merced’s average Hepatitis A Virus concentrations (HAV/PMMoV) showed no detection between the most recent two weeks and the two weeks prior to that. Los Banos’ average showed no detection.

Human Adenovirus Group F

Merced’s average Human Adenovirus Group F concentrations (HAdV_F/PMMoV) remained the same 🔄 between the most recent two weeks and the two weeks prior to that. Los Banos’ average decreased ⬇️ by 8.9%.

Rotavirus

Merced’s average Rotavirus concentrations (Rotavirus/PMMoV) increased ⬆️ by 194% between the most recent two weeks and the two weeks prior to that. Los Banos’ average increased ⬆️ by 1153%.

Enterovirus D68

Merced’s average Enterovirus D68 concentrations (EV_D68/PMMoV) showed no detection between the most recent two weeks and the two weeks prior to that. Los Banos’ average showed no detection.

Candida auris

Merced’s average Candida auris concentrations (C_auris/PMMoV) showed no detection between the most recent two weeks and the two weeks prior to that. Los Banos’ average showed no detection.

Parainfluenza

Merced’s average Parainfluenza concentrations (HPIV/PMMoV) decreased ⬇️ by 14% between the most recent two weeks and the two weeks prior to that. Los Banos’ average increased ⬆️ by 45.1%.

Stanislaus County

SARS-CoV-2

Modesto’s average SARS-CoV-2 concentrations (N/PMMoV) increased ⬆️ by 130% between the most recent two weeks and the two weeks prior to that. Turlock’s average decreased ⬇️ by 75.4%.

Fig 1. Modesto

Fig 2. Turlock

Influenza A

Modesto’s average Influenza A concentrations (Flu A/PMMoV) increased ⬆️ by 41.3% between the most recent two weeks and the two weeks prior to that. Turlock’s average +LL.

Influenza B

Modesto’s average Influenza B concentrations (Flu B/PMMoV) showed no detection between the most recent two weeks and the two weeks prior to that. Turlock’s average decreased ⬇️ by 14.3%.

RSV

Modesto’s average RSV concentrations (RSV/PMMoV) remained the same 🔄 between the most recent two weeks and the two weeks prior to that. Turlock’s average +LL.

HMPV

Modesto’s average HMPV concentrations (HMPV/PMMoV) increased ⬆️ by 123% between the most recent two weeks and the two weeks prior to that. Turlock’s average remained the same 🔄.

Norovirus

Modesto’s average Norovirus concentrations (Norovirus/PMMoV) increased ⬆️ by 25.1% between the most recent two weeks and the two weeks prior to that. Turlock’s average decreased ⬇️ by 76.5%.

Hepatitis A Virus

Modesto’s average Hepatitis A Virus concentrations (HAV/PMMoV) showed no detection between the most recent two weeks and the two weeks prior to that. Turlock’s average increased ⬆️ by 33.8%.

Human Adenovirus Group F

Modesto’s average Human Adenovirus Group F concentrations (HAdV_F/PMMoV) increased ⬆️ by 112% between the most recent two weeks and the two weeks prior to that. Turlock’s average remained the same 🔄.

Rotavirus

Modesto’s average Rotavirus concentrations (Rotavirus/PMMoV) increased ⬆️ by 13.1% between the most recent two weeks and the two weeks prior to that. Turlock’s average decreased ⬇️ by 97.8%.

Enterovirus D68

Modesto’s average Enterovirus D68 concentrations (EV_D68/PMMoV) decreased ⬇️ by 16.7% between the most recent two weeks and the two weeks prior to that. Turlock’s average showed no detection.

Candida auris

Modesto’s average Candida auris concentrations (C_auris/PMMoV) showed no detection between the most recent two weeks and the two weeks prior to that. Turlock’s average showed no detection.

Parainfluenza

Modesto’s average Parainfluenza concentrations (HPIV/PMMoV) decreased ⬇️ by 36.7% between the most recent two weeks and the two weeks prior to that. Turlock’s average decreased ⬇️ by 18.1%.

Yolo County

SARS-CoV-2

Davis’ average SARS-CoV-2 concentrations (N/PMMoV) decreased ⬇️ by 36.1% between the most recent two weeks and the two weeks prior to that. Esparto’s average decreased ⬇️ by 29.8%. Winters’ average decreased ⬇️ by 75.7%. Woodland’s average increased ⬆️ by 11.6%.

Fig 1. Davis

Fig 2. Esparto

Fig 3. Winters

Fig 4. Woodland

Influenza A

Davis’ average Influenza A concentrations (Flu A/PMMoV) +LL between the most recent two weeks and the two weeks prior to that. Esparto’s average increased ⬆️ by 191%. Winters’ average remained the same 🔄. Woodland’s average increased ⬆️ by 265%.

Influenza B

Davis’ average Influenza B concentrations (Flu B/PMMoV) remained the same 🔄 between the most recent two weeks and the two weeks prior to that. Esparto’s average remained the same 🔄. Winters’ average showed no detection. Woodland’s average remained the same 🔄.

RSV

Davis’ average RSV concentrations (RSV/PMMoV) +LL between the most recent two weeks and the two weeks prior to that. Esparto’s average remained the same 🔄. Winters’ average +LL. Woodland’s average increased ⬆️ by 1504%.

HMPV

Davis’ HMPV concentrations (HMPV/PMMoV) +LL between the most recent two weeks and the two weeks prior to that. Esparto’s average remained the same 🔄. Winters’ average +LL. Woodland’s average decreased ⬇️ by 97.5%.

Norovirus

Davis’ Norovirus concentrations (Norovirus/PMMoV) increased ⬆️ by 11.8% between the most recent two weeks and the two weeks prior to that. Esparto’s average increased ⬆️ by 10.5%. Winters’ average increased ⬆️ by 122%. Woodland’s average decreased ⬇️ by 24.8%.

Hepatitis A Virus

Davis’ Hepatitis A Virus concentrations (HAV/PMMoV) showed no detection between the most recent two weeks and the two weeks prior to that. Esparto’s average showed no detection. Winters’ average showed no detection. Woodland’s average decreased ⬇️ by 16.7%.

Human Adenovirus Group F

Davis’ Human Adenovirus Group F concentrations (HAdV/PMMoV) decreased ⬇️ by 68% between the most recent two weeks and the two weeks prior to that. Esparto’s average decreased ⬇️ by 36.5%. Winters’ average remained the same 🔄. Woodland’s average increased ⬆️ by 135%.

Rotavirus

Davis’ Rotavirus concentrations (Rotavirus/PMMoV) increased ⬆️ by 818% between the most recent two weeks and the two weeks prior to that. Esparto’s average remained the same 🔄. Winters’ average increased ⬆️ by 25%. Woodland’s average decreased ⬇️ by 84.8%.

Enterovirus D68

Davis’ Enterovirus D68 concentrations (EV_D68/PMMoV) remained the same 🔄 between the most recent two weeks and the two weeks prior to that. Esparto’s average showed no detection. Winters’ average showed no detection. Woodland’s average remained the same 🔄.

Candida auris

Davis’ Candida auris concentrations (C_auris/PMMoV) showed no detection between the most recent two weeks and the two weeks prior to that. Esparto’s average showed no detection. Winters’ average showed no detection. Woodland’s average showed no detection.

Parainfluenza

Davis’ Parainfluenza concentrations (HPIV/PMMoV) increased ⬆️ by 70.6% between the most recent two weeks and the two weeks prior to that. Esparto’s average increased ⬆️ by 149%. Winters’ average decreased ⬇️ by 9.7%. Woodland’s average decreased ⬇️ by 76.8%.

All Counties

## Time difference of 11.4712 secs

Mpox Update

Davis’ average Mpox concentrations (Mpox/PMMoV) showed no detection between the most recent two weeks and the two weeks prior to that. Esparto’s average showed no detection. Winters’ average showed no detection. Woodland’s average showed no detection. Merced’s average showed no detection. Los Banos’ average showed no detection. Modesto’s average showed no detection. Turlock’s average showed no detection https://healthycvtogether.org/monkeypox-data/